The moles of ammonia needed to produce 1.3 mole of water is 0.84 mol.
balance chemical equation for the reaction
[tex]4NH_{3}+5O_{2}- > 4NO +6H_{2}O[/tex]
In chemistry, stoichiometry is the measurement of the ratios in which different substances or elements interact. The laws of conservation of mass, energy, and weights or volumes serve as the foundation for the rules used to determine stoichiometric relationships.
stoichiometric moles of ammonia reacting = [tex]\frac{moles}{stoichiometry}[/tex]
stoichiometric moles of water reacting = [tex]\frac{1.3}{6} =0.21[/tex]
0.21 stoichiometric moles of water is given by 0.21 stoichiometric moles of water
so moles of ammonia will form = stoichiometric moles * stoichiometry
moles of ammonia will form = 0.21 * 4 = 0.84 mol
so moles of ammonia produced by reaction = 0.84 mol
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Question 1 For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. HCl(aq) + NaOH(aq) + NaCl(aq) + H20(1)
A student was given the task of titrating a 20.mL sample of 0.10MHCl(aq) with 0.10MNaOH(aq). The HCl(aq) was placed in an Erlenmeyer flask. An equation for the reaction that occurs during the titration is given above. (a) According to the equation for the reaction, if the amount of the reactants is halved, how does this affect the amount of H20(I) produced in the reaction?
Titration is a quantitative analysis method for determining the concentration of a substance from a measured titrant. According to the equation, if the reactants are halved, the amount of H2O produced will be halved.
The molecular equations for sodium hydroxide, hydrochloric acid, sodium chloride, and water can be expressed as:
HCl + NaOH ⇒ NaCl + [tex]H_{2}[/tex]O
In the given equations, the spectator ions and the ionic equation can be distinguished as follows:
H⁺ + Cl⁻ Na⁺ + OH⁻ ⇒ Na⁺ + Cl⁻ + 2H⁺ + O⁻²
The net ionic equation is:
H⁺ + OH⁻ ⇒ [tex]H_{2}[/tex]O
From the above equation, we can see that the production of water molecules depends on the number of reactants. The reactants are,
H⁺ and OH⁻.
Therefore, when the number of reactants is halved, the resulting water molecules are halved.
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The table below describes geological events.
Event Boundary where they occur
Convergent Divergent Transform
A Yes Yes No
B Yes Yes Yes
Which statement is most likely correct? (1 point)
a
Event A represents earthquakes and Event B represents volcanic eruptions.
b
Event A represents volcanic eruption and Event B represents earthquakes.
c
Event A represents formation of ocean basins and Event B represents earthquakes.
d
Event A represents earthquakes and Event B represents formation of ocean basins.
Based on this table which describes geological events, a statement that is most likely correct include the following: B. Event A represents volcanic eruption and Event B represents earthquakes.
What is a divergent boundary?Generally speaking, a divergent boundary is characterized by plates that are moving apart from one another, as well as basaltic volcanism and seafloor spreading. Also, a typical example of a divergent is the Mid-Atlantic Ridge.
In this context, we can reasonably infer and logically deduce that Event A is a geological event which most likely represents volcanic eruption because it occurred at both convergent and divergent boundary.
Furthermore, a convergent boundary simply refers to a region where lithosphere or crust is sinking into the mantle. Also, an example of a convergent is a region where subduction zones or collisions occur such as the west coast of South America.
In conclusion, a transform boundary simply refers to a boundary that is normally devoid of volcanism, but allows for the occurrence of earthquakes.
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This energy diagram shows the allowed energy levels of an electron in a certain atom or molecule: energy Use this diagram to complete the table below. Which is the ground state? (pick one) How many excited states are there? How many lines are in the absorption line spectrum? Which transition causes the absorption line at the shortest wavelength? Which transition causes the absorption line at the longest wavelength?
The transition causing the absorption line at the longest wavelength is the transition from -2 to +2.
Ground State: -2
Number of Excited States: 4
Number of Lines in the Absorption Line Spectrum: 8
Transition Causing Absorption Line at Shortest Wavelength: -3 to -2
Transition Causing Absorption Line at Longest Wavelength: -2 to +2
The ground state is the state at the bottom of the diagram, which is -2.
There are 4 excited states, which are -3, -2, +1, and +2.
There are 8 lines in the absorption line spectrum, which are the 4 transitions from the ground state to the excited states, and the 4 transitions from the excited states back to the ground state.
The transition causing the absorption line at the shortest wavelength is the transition from -3 to -2.
The transition causing the absorption line at the longest wavelength is the transition from -2 to +2.
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How many moles are in aspartame?
The quantity of atoms or molecules per gram of atomic weight is known as aspartame number, which is 6.022 1023/mole.
A dipeptide made up of the amino acids phenylalanine and aspartic acid is called aspartame and is its methylester. People with phenylketonuria, who must carefully limit their intake of phenylalanine, must be made aware of the ingredient's existence in the medicinal product and the quantity present in each dose unit. In turn, 10 g of aspartame contains 0.034 moles of molecules. How many nitrogen atoms make up 1.2 grams of aspartame? Due to aspartame's 294.347 g/mol molar mass, 1.2 g is equal to 1.2 g / 294 g/mol, or 0.0041 moles. Aspartame is digested in the body, unlike certain other potent sweeteners, and as a result.
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a scientist oserves a chemical reaction as it takes place. how can the scientist so in order to tell if the reaction has acheived equilibrium
A chemical reaction reaches equilibrium when the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of the reactants and products.
A scientist observing a chemical reaction can tell if the reaction has achieved equilibrium by monitoring the following: Concentration of reactants and products: The concentrations of reactants and products should no longer change over time if the reaction has reached equilibrium. Temperature: If the reaction has reached equilibrium, the temperature of the system should remain constant. Pressure: If the reaction is taking place in a closed container, the pressure of the system should also remain constant if the reaction has reached equilibrium. It's worth noting that the equilibrium is a dynamic process, meaning that the concentrations of reactants and products will remain constant over time, but the chemical reaction is still taking place.
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Write the expression using a single exponent.
–4^7(4^7)
–4^4
–4^11....correct
4^11
–16^11
part 2 of it is
5^9/5^3=5a
a=_____ ........... 6
Part 3 is (6^2)^7
6^5
6^9
6^14...correct
6^49.
The mathematical expressions written using a single exponent are as follows:
4⁴(4⁷) = 4¹¹
5⁹/5³; a = 6
(6²)⁷ = 6¹⁴
What are exponents in a mathematical expression?A number or letter written above and to the right of a mathematical expression known as the base is termed an exponent. It denotes that the base is to be increased in strength.
Consider the following expression: xⁿ
In the given expression above, the base is x, while the exponent or power is n. For expressions having the same base, the exponents are added if the expressions are to multiplied, and subtracted when the expressions are to be divided.
The exponents are multiplied if the exponents are raised to a power.
Considering the given expressions:
4⁴(4⁷) = 4¹¹
5⁹/5³ = 5⁶
Hence, a = 6
(6²)⁷ = 6¹⁴
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How many liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
4 liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
To find the amount of 30% acid that must be added to 2 liters of 15% acid to result in a mixture that is 25% acid, we can use the concept of percentage concentration. The percentage concentration is defined as the ratio of the number of moles of solute (in this case acid) to the total number of moles of the solution.
Let's call x the number of liters of 30% acid to be added. Then the final volume of the solution is (2+x) liters.We know that the final concentration of the solution is 25%, so we can write the following equation:
(moles of acid in 2 liters of 15%) + (moles of acid in x liters of 30%) / (2+x) = 0.25
We can now use the percentage concentration to find the number of moles of acid in each volume of acid:
moles of acid in 2 liters of 15% = (2L * 0.15) = 0.3 moles
moles of acid in x liters of 30% = (xL * 0.30) = 0.30x molesWe can now substitute these values in the equation above:
(0.3) + (0.30x) / (2+x) = 0.25
Solving for x we can find the volume of 30% acid that needs to be added to the 2 liters of 15% acid:
0.3 + 0.30x = 0.25(2+x)
0.3 + 0.30x = 0.5 + 0.25x
0.05x = 0.2
x = 4 L. Therefore, 4 liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
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In the equation 2K(s) + 2H2O(l) → 2K(OH)(aq) + H2(g), identify the physical state of each reactant and product
K can be found in solid form. Water exists as a liquid. KOH can be found in aqueous form. Hydrogen exists as a gas.
What is reactant and product?Reactants are chemical compounds that engage in chemical reactions, resulting in the formation of new chemicals known as products. Products are the new compounds created as a result of the chemical reaction between reactants.
Reactant- The substances which participate in a chemical reaction, are called reactants. A chemical reaction describes the process by which atoms, the fundamental building blocks of matter, rearrange themselves to form new combinations. Reactants are raw materials that react with one another.
Product- A product is a substance that is present at the end of a chemical reaction. In the equation above, the zinc and sulfur are the reactants that chemically combine to form the zinc sulfide product.
Here,
K=solid
H₂O=liquid
KOH=aqueous
H₂=gas
K exist in solid form. H₂O exist in liquid form. KOH exist in aqueous form. H₂ exist in gas form.
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Calcium oxide reacts with water to form calcium hydroxide. Type of reaction ____________________________ Balanced chemical equation:
Calcium oxide reacts with water to form calcium hydroxide which is a type of combination reaction. Therefore, the balanced chemical equation is: CaO+H2O→Ca(OH)2+Δ
The symbolic representation of a chemical reaction is a chemical equation. In this, the formulas and symbols for the reactants and products are used to depict them. Since the Middle Ages, quicklime, also known as calcium oxide, has been utilized as an alkaline substance. One of the oldest substances that humans have ever discovered is quicklime. Other names for it include lime or burned lime. Lime, or calcium oxide, is a chemical substance with the formula CaO. When calcium oxide, also referred to as quick lime, and water combine, calcium hydroxide is created (commonly known as slaked lime). This reaction is an example of a combination reaction.
Calcium oxide + Water → Calcium hydroxide
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For your new candle-making business, you need to purchase a large amount of a unique scented wax. You plan to charge $9. 95 per large candle. The wax you need is availbale form a U. S. Supplier for $25. 53/1b and also from a German supplier for €11. 90/kg. The current exchange rate is $1=€0. 76 and 1 kg=2. 20 lb
What is the price of the wax from the U. S. Supplier in €/kg?
What is the price of the wax from the German supplier in $/lb
The price of the wax from the U.S. supplier in €/kg would be: €25.53 / 2.20 lb = €11.67/kg.
The price of the wax from the German supplier in $/lb would be $11.90 / 0.76 = $15.68/lb.
This price is calculated by taking the cost of the wax in US dollars and converting it to Euros using the current exchange rate of $1 = €0.76.
This price is calculated by taking the cost of the wax in Euros and converting it to US dollars using the current exchange rate of $1 = €0.76. It's important to note that the price of the wax from the German supplier is higher than the price from the US supplier when converted to dollars per pound.
This is because the price per kg is lower but the conversion to pound makes it higher.
The price of the wax from the U.S. supplier in €/kg would be: €25.53 / 2.20 lb = €11.67/kg.
The price of the wax from the German supplier in $/lb would be $11.90 / 0.76 = $15.68/lb.
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is the specific heat capacity of gaseous ethanl greater than. less thean or equal to the speciifc heat captity of liquid ethanol
The specific heat capacity of the gaseous ethanol is less than the specific heat capacity liquid ethanol.
The specific heat capacity is given as :
Q = mc ΔT
where ,
Q = heat
m = mass
c = specific heat capacity
ΔT = temperature change
The heating curve represented the temperature , T in the y axis and the heat added at the x - axis. the slope is given as :
T / Q = 1 / C
T is the temperature and the c is the specific heat capacity.
Thus, the heat capacity of the gaseous ethanol is low as compared to the liquid ethanol.
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So
A scientist collected a 37.50 g sample of a
compound. Determine the % composition
of Cr in the compound if the sample is
made up of 19.01g O, Oxygen and 4.76 g
C, Carbon, and the remainder is Cr,
chromium. Type your answer to two
decimal places. Do not put the percent
sign.
Mass is a measure of an object's resistance to acceleration.
1. Calculate the total mass of the sample:
37.50 g
2. Calculate the total mass of the elements O and C:
19.01 g + 4.76 g = 23.77 g
3. Calculate the mass of Cr:
37.50 g - 23.77 g = 13.73 g
4. Calculate the composition of Cr in the compound:
13.73 g / 37.50 g x 100 = 36.56
What is Mass?
The resistance to acceleration of an object is measured by its mass. It is a fundamental property of physical objects and is often expressed in kilograms (kg) or grams (g). Mass is related to the inertia of an object, which is a measure of how difficult it is to change the object's motion. Mass also determines the strength of the gravitational force acting on an object.
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The table shows the nature of the reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants Products
Ionic compound + Ionic compound Ionic compound + Ionic compound
Which of the following is true about this type of chemical reaction?
It is a single replacement reaction, and all four compounds are different.
It is a double replacement reaction, and all four compounds are different.
It is a single replacement reaction, and each compound has the same set of ions.
It is a double replacement reaction, and each compound has the same set of ions.
The reaction that has been shown in the table above is a double replacement reaction, and each compound has the same set of ions. Option D
What is a reaction?Another word that we can use for reaction is what we call a chemical change. We know that a chemical change is the kind of change that will lead to the formation of a new product. It is an irreversible process as we can not be able to get back the reactants again.
We should note that there are various types of reactions. In a single replacement reaction, you would notice that there is only one substance that reacts and causes a change while in the double replacement reaction, the anions that are in the compounds that underwent the reaction would just exchange anion partners and we would have two ionic products.
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For each of the following balanced chemical equations, write all possible mole ratios: a. 2Ca + O2 ⎯→ 2CaO b. Mg + 2HF ⎯→ MgF2 + H2
The mole ratio of the reactants and products is
a. 2 : 1 : 2
b. 1: 2:1:1
The ratio of the mole quantities of any two compounds present in a balanced chemical reaction is known as the mole ratio. A comparison of the ratios of the molecules required to accomplish the reaction is given by the balancing chemical equation. The coefficients of each species in the reactants and products are used to calculate the mole ratio of the reactants and products. The mole ratio of the reactants and products, as demonstrated by the equation in the question, is 2: 1: 2 and 1:2:1:1 respectively.
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How many protons neutrons and electrons does carbon-14 have if it has a neutral charge?
Protons, neutrons and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.
The total of an element's protons plus neutrons is that element's mass number. One atomic mass unit, or amu, roughly equals the weight of neutrons and protons. While atomic number equal to proton and electron.
The proton can be calculate as follows:
C−14 has atomic no = 6 and mass no = 14.
so
No of electrons = No of protons = atomic no = 6
No of neutron = mass no-atomic no = 14−6=8
Therefore, Protons, neutrons, and electrons that carbon-14 have if it has a neutral charge is 6 electrons, 8 neutron, and 6 proton.
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Hello can you please help me?
here is my big question:
considering that in any part of the periodic Table of the Elements, if the element's position is higher and more to the right, its atomic radius is smaller. So our element has more metallic character. According to this point, if we consider the elements from iron to zinc, zinc is more reactive than iron and copper. So why is the reactivity of copper less than iron?
Answer:
because I'm the reactivity table of metals it shows that iron is indeed more reactive than copper
Explanation:
potassium (most reactive)
sodium
lithium
calcium
magnesium
aluminum
zinc
iron
tin
lead
hydrogen
copper
mercury
silver
gold( least reactive)
How many grams are in 0.89 moles of CaCI2
0.0080 grams are in 0.89 moles of CaCI₂.
What is mole ?
The mole (M) is defined as it contain exactly 6.023 × 10²³ elementary entities present in it. 1 mole is exactly equal to the 6.023 × 10²³ elementary entities.
We can solve the above problem as follows;
So,
1 Mole of substance = Molar mass of the substance.
The given compound named is Calcium Chloride.
Then,
Molar mass of Calcium chloride = 1 mole
Molar mass of CaCl₂ = 40 + 2 × 35.4
= 110.9g/mol
Therefore,
110.9 grams of CaCl₂ = 1 mole
1 gram of CaCl₂ = 1 / 110.9
0.89 grams of CaCl₂
= 1 / 110 × 0.89
= 0.0080 grams
Thus, 0.0080 grams are in 0.89 moles of CaCI₂.
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4. How many molecules are in 32.6 grams of potassium oxide?
a. Go from grams to moles
b. Then moles to molecules
2.084*10^23 molecules are in 32.6 grams of potassium oxide.
What Is Molar mass ?A chemical's molar mass is its weight in grammes for one mole. A mole is a unit used to measure how many atoms, molecules, and ions are present in a substance. The number of molecules in a mole of any substance is 6.022 x 1023.
Although the terms "molecular mass" and "formula mass," which refer to molar mass specifically for molecular compounds, are frequently used interchangeably, their definitions vary according to the most reputable sources.
Molar mass of K2O is 94.196g
Given mass = 32.6g
1 mole of K2O = 94.196g
So, 32.6g will be 32.6/94.196g
i.e. 0.346moles
1 mole of K2O = 6.023*10^23molecules of
0.346moles will be 2.084*10^23 molecules
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Cant seem to figure this one out…
The specific heat capacity of the substance, given that the subtance changes temperature from 35.0 °C to 65.0 °C when it absorb 15000 J of energy is 50 J/gºC
How do I determine the specific heat capacity of the substance?We'll begin by obtaining the change in the temperature of the substance.etails below:
Initial temperature (T₁) = 35.0 °CFinal temperature (T₂) = 65.0 °CChange in temperature (ΔT) =?ΔT = T₂ - T₁
ΔT = 65 - 35
ΔT = 30 °C
Finally, we shall determine the specific heat capacity of the substance. Details below:
Mass of substance (M) = 10 gHeat absorbed (Q) = 15000 JChange in temperature (ΔT) = 30 °CSpecific heat capacity (C) = ?Q = MCΔT
15000 = 10 × C × 30
15000 = 300 × C
Divide both sides by 300
C = 15000 / 300
C = 50 J/gºC
Thus, the specific heat capacity of the substance is 50 J/gºC
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How many moles of KCI are produced at the same time at 9 moles O2? 2KCIO3=2KCI+3O2
Answer:
Explanation:
To determine how many moles of KCI are produced at the same time as 9 moles of O2, you can use the balanced chemical equation for the reaction. The balanced equation for the reaction of potassium chlorate (KCIO3) with oxygen gas (O2) is:
2KCIO3 = 2KCI + 3O2
This equation tells us that for every 2 moles of potassium chlorate that react, 2 moles of potassium chloride (KCI) are produced, along with 3 moles of oxygen gas.
Since we know that 9 moles of O2 are produced, we can use the balanced equation to determine how many moles of KCI are produced as well. Since the ratio of O2 to KCI in the equation is 3:2, we can divide 9 moles of O2 by 3 and multiply the result by 2 to find the number of moles of KCI that are produced:
9 moles O2 / 3 = 3 moles KCI
So, for 9 moles of O2, 6 moles of KCI are produced.
Answer: 6 mol KCI
Explanation:
LPG consists of mainly
A. methane, ethane and hexane
B. ethane, hexane and nonane
C. methane, hexane and nonane
D. methane, butane and propane
D. methane, butane and propane
Propane and butane are both types of alkane hydrocarbons with relatively low boiling points, which allows them to be easily converted to a liquid form at relatively low pressures. This makes them easy to transport and store. Methane, ethane, and hexane are also alkane hydrocarbons, but they are not typically found in large amounts in LPG.
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you have a sample contianing 4.92x10^23 molecules of nitrogen dioxide. how many grams of nitrodgen dioxide do you have
As a result, 6.022 x 10 23 molecules of water weigh 18.02 g. A mole of sodium chloride (6.02 x 1023 formulas) weighs 58.44 g.
A substance's mole is equivalent to 6.022 x 1023 of that material (such as atoms, molecules, or ions). One mole, or 6.022 x 1023 molecules, is equal to one gram's worth of any given substance's molecular mass. Thus, a mole of oxygen (O2) weighs 32 kilos and has a molecular mass of 6.022 1023.
12 grams of pure carbon-12 weigh exactly one mole, or 6.022 x 1023 atoms, making one mole equivalent to 12 grams of pure carbon-12. • Avogadro's Number refers to the quantity of particles contained in one mole (6.0221421x1023).
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A compound has the following percentage composition: 40.0% carbon, 6.72% hydrogen, 53.28% oxygen. How many moles of hydrogen are present in 100 g of the compound described above
The compound is Glucose.
C: 40 g divided by 12 g per mol equals 3.333 mol
H: 6.72 g/mol (1 g) = 6.72 mol
O: 53.28 g/mol (16 g) = 3.33 mol
Subtract the lesser amount of moles.
C: 3.333 / 3.33 = 1.00
H: 6.72 / 3.33 = 2.02 ≈ 2
O: 3.33/3.33 = 1.00
Statistical method
The empirical formula's molar mass is 12 g/mol + 2*1 g/mol + 16 g/mol = 30 g/,ol.
180 g/mol / 30 g/mol = 6 times the mass of the empirical formula is contained in the molar mass.
The empirical formula of compound is six times the molecular formula.
=>[tex]C_{6} H_{12} O_{6}[/tex]
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I have 5mg of a powder chemical substance that I need to dissolve in a solvent with a 2g/L solubility. I ultimately need to give two doses of the chemical: 10ug/L and 100 ug/L. Ultimately, I must add between 5ul and 10ul of the stock solution. I can create up to 3 stock dilutions. How can I solve this problem? Please show all work so I can learn! Thank you.
We need to take 5ul of stock solution and add it to 5ul of diluent to achieve a final concentration of 100ug/L.
How calculate the stock solution?To solve this problem, you will need to create a stock solution of the chemical substance and then dilute it to the desired concentrations. Here's one way you could approach it:
Create a stock solution by dissolving the 5mg of powder in a solvent with a 2g/L solubility. We know that the solubility of the substance is 2g/L, so we can use the formula:
Stock solution concentration = (mass of substance) / (volume of solvent)
In this case, the mass of the substance is 5mg and the volume of solvent is 1L. So, the stock solution concentration is:
5mg / (1L) = 5mg/L
Dilute the stock solution to the desired concentration for the first dose of 10ug/L. To do this, we can use the formula:
Desired concentration = (volume of stock solution) / (volume of diluent)
In this case, we want a final concentration of 10ug/L, so we'll let the volume of stock solution be x and the volume of diluent be (5ul-x). Then we can set up the equation:
10ug/L = (x) / (5ul-x)
Solving this equation:
x = 0.5ul
Therefore, we need to take 0.5ul of stock solution and add it to 5ul of diluent to achieve a final concentration of 10ug/L
Dilute the stock solution to the desired concentration for the second dose of 100ug/L. Using the same formula as before:
Desired concentration = (volume of stock solution) / (volume of diluent)
In this case, we want a final concentration of 100ug/L, so we'll let the volume of stock solution be y and the volume of diluent be (10ul-y). Then we can set up the equation:
100ug/L = (y) / (10ul-y)
Solving this equation:
y = 5ul
Therefore, we need to take 5ul of stock solution and add it to 5ul of diluent to achieve a final concentration of 100ug/L
So, you can create a stock solution by dissolving 5mg of powder in a solvent with 2g/L solubility and obtain a stock solution of 5mg/L. With this stock solution, you can create two dilutions, the first one is 10ug/L by adding 0.5ul of stock solution to 5ul of diluent, and the second one is 100ug/L by adding 5ul of stock solution to 5ul of diluent.
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how does the pitcher plant use chemical reactions
Answer: Pitcher plant have adapted themselves to live in poor nutriet soil As they are carnivorous and feed on the insects is the major adptation for them as they does not have proper nutrients,availabilty for the growth.
Explanation:
A chemistry student needs of glycerol for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of glycerol is . Calculate the volume of glycerol the student should pour out. Round your answer to significant digit
The student is to weigh out 94.5g of glycerol in accordance with the provided statement.
Glycerol: Is it simply sugar?Glycerin is a kind of carbohydrate known as a polyol, along with other sugar alcohols including sorbitol and erythritol. Glycerin has a complex taste, but unlike sugar I've already discussed—it is not absorbed by the body as sugar and does not raise blood sugar levels. Glycerol may be safe for short-term treatment when taken orally. Headaches, lightheadedness, bloat, nausea, and diarrhea are possible side effects. Glycerol appears to be safe when used topically. It might result in burning, itching, and redness.
1mL = 1cm³
Quantity = 75mL = 75cm³
1.26 g/cm³ is the density.
Mass = ?
Mass is equal to the product of volume and density.
Mass = 1.26 * 75 = 94.5g
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The complete question is-
A chemistry student needs 75.0 mL of glycerol for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of glycerol is 1.26 g.cm⁻³. Calculate the mass of glycerol the student should weigh out. Be sure your answer has the correct number of significant digits.
What is the structure of a compound of molecular formula C10H14O2 that shows a strong IR absorption at 3150 ¾2850 cm-1 and gives the following 1H NMR absorptions: 1. 4 (triplet, 6H); 4. 0 (quartet, 4H); and 6. 8 (singlet, 4H) ppm?
First, we must compute the index of hydrogen deficiency, IHD, using the molecular formula of the compound [tex]C_{10}H_{14}O_{2}[/tex].
What is a spectrum data?
Spectrum data is data collected from spectroscopic experiments, which measure the interaction of matter with electromagnetic radiation. This data can be used to identify the chemical composition of a sample, as different elements and molecules absorb and emit radiation at different wavelengths.
Then, number of C atoms - [tex]\frac{number of atoms}{2} + 1[/tex]
= [tex]10 + \frac{14}{2} + 1[/tex]
= [tex]10 - 7 + 1[/tex]
= [tex]4[/tex]
Based on the molecular structure, this tells us how many multiple bonds and rings the compound has.
This compound contains four unsaturated bonds. We can tell from the spectrum data that it is aromatic (chemical shifts above 6 comes from aromatic protons). Based on this, we can conclude that the structure of this compound contains a benzene ring. Four IHD are found in the benzene ring, one from the ring and three from double bonds.
Following that, IR spectrum data revealed that absorption on [tex]3150-2850 cm^{-1}[/tex] indicated hybridised CH bonds.
The following chemical shifts are observed in the NMR spectrum data:
On 1,4ppm, it becomes a 6H triplet. It has two protons in its neighbourhood because it is a triplet, and it comes from [tex]CH_{3}(1)[/tex]. This group must be linked to the [tex]CH_{2}(2)[/tex].
A quartet on 4,0ppm, belongs to 4H from [tex]CH_{2}(2)[/tex]. It has 3 protons in neighborhood stop it it attached to the [tex]CH_{3}(1)[/tex] and singlet on 6,8ppm comes of aromatic protons, 4H (3).
Based on the [tex]^{1} HNMR[/tex] spectrum data, we can only attach the two O atoms to the benzene ring and the [tex]CH_{2}(2)[/tex] group.
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When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is
An alpha particle bombardment of aluminum with an atomic number of 27 results in the production of a neutron and phosphorus 15. The particular isotope formed is aluminum-28.
Fundamental alterations take place at the level of the atomic nucleus during nuclear reactions. Analyze the properties of the neutron, which has a mass similar to that of a proton but no electric charge. As a result, when it interacts with the aluminum core, the atomic number should remain constant but the atomic mass should rise by one unit. The newly produced atom is in an excited state when it transitions to the base state with the emission of a high-energy radiation called a gamma ray. Aluminum-28 isotope is formed. ⁷A₂₇ + ⁰n₁ → ⁷Al₂₈ˣ
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An ideal gas (which is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at the top. (Figure 2) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 6.40 to 3.20 L . When the external pressure is increased to 2.50 atm , the gas further compresses from 3.20 to 2.56 L .
In a separate experiment with the same initial conditions, a pressure of 2.50 atm was applied to the ideal gas, decreasing its volume from 6.40 to 2.56 L in one step.
If the final temperature was the same for both processes, what is the difference between q for the two-step process and q for the one-step process in joules?
Answer: -162,120J
Explanation:
Okay, so q stands for work, given by the formula q = -P∆V,
For the first round, we have 2atm (for P) and a volume change of 3.2 (6.4-3.2) for the first experiment.
Find the work: q = -2 • (3.2 - 6.4) = 6.4L/atm
For the second experiment, it is now 2.5atm, with the change in volume going from 3.2 to 2.56.
So, work is q = -2.5(2.5 - 3.20) = 1.6L/atm
Add the total work: 1.6 + 6.4 = 8L/atm
To find the Joules per L/atm, recall that a mol of gas in K is 8.31447J, while the gas constant where a liter of gas per mol in K is 0.08206L/atmK. Divide these two values, which leaves us with 101,325J
So, for the first round, multiply 8 x 101,325, which leaves us with 810,600J.
Second round: The pressure is 2.5atm, with the volume change from 6.40 to 2.56
Solve for work: q = -2.5(2.56-6.4) = 9.6L/atm
Multiply with the Joule unit found earlier: 9.6 x 101,325 = 972,720J.
To find the difference, subtract the value of the single-step process (second round) from the first round (multistep)
810600 - 972720 = -162,120J. Therefore, it takes more heat to do the single step than the multistep process.
In a lifetime, the average American uses more than a half ton (500 kg) of copper in coins, plumbing, and wiring. Copper is obtained from sulfide ores, such as chalcocite [copper(I) sulfide] by a multistep process. After initial grinding, the ore is "roasted" (heated strongly with oxygen gas) to form powdered copper(I) oxide and gaseous sulfur dioxide. How many moles of oxygen are required to roast 10. 0 mol of copper(I) sulfide?
The required moles of oxygen is 10.0 mol of [tex]O_2[/tex] (Oxygen) is required to roast 10.0 mol of CuS (copper(I) sulfide).
Because the Sulphur absorbs the impurities as fumes and reacts with the remaining ore to produce Copper metal by auto-reduction, the ore is partially roasted.
[tex]Cu_2S.Fe_2S_3+O_2→Cu_2S+2FeS+SO_2[/tex]
[tex]Cu_2S+3O_2→Cu_2O+2SO_2[/tex]
Sulfide ore is heated by a heat source in the presence of air during the roasting process. The ore or ore concentrate is treated with very well-liked air during roasting. This method is frequently used when processing sulfide ores. The sulfide that is present during roasting is changed into oxide and emitted as sulfur dioxide, a gas.
Roasting's primary purposes are to eliminate volatile impurities and oxidize the ore by turning it into oxide.
A significant copper resource is COPPER-PYRITES, often known as chalcopyrite, which is a copper iron sulfide (CuFeS2).
To roast 10.0 mol of copper(I) sulfide (CuS), the balanced equation is CuS + O2 → CuO + SO2.
For every mole of CuS that reacts, one mole of O2 is consumed. Therefore, 10.0 mol of [tex]O_2[/tex] is required to roast 10.0 mol of CuS.
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