Nature contains questions that can be answered by science.
The correct option is B).
What is nature?
The word nature refers to the things we can see with our eyes generally they include: plants, animals, the landscape, and other features and products of the earth, as opposed to humans or human creations.
The science of nature helps us to understand how the world and the universe around us work.
There are five major branches of the Science of Nature:
.Chemistry
.Astronomy
.Earth science
.Physics
.Biology.
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Answer
A. Astrology
Explanation:
The rest isnt science its just like puedoscience so its A.
Calculate the final concentration of a solution created through the following process: 1.7 L of a 2.4 M NaF solution is diluted with water to 3.3 L of NaF solution.
The final concentration of the diluted solution of NaF is equal to 1.24 M.
What is the dilution law?The concentration and the volume of the stock solution or dilute solution can be determined from the following equation:
M₁V₁ = M₂ V₂
where M₁ and V₁ are the concentration and volume of the stock or concentrated solution respectively and M₂ and V₂ are the concentration and volume of the diluted solution.
Given, a stock solution of NaF of concentration, M₁ = 2.4 M
The concentration of the diluted solution of NaF is M₂.
The volume of the concentrated solution of NaF, V₁ = 1.7 L
The volume of diluted solution of NaF, V₂ = 3.3 L
Substitute the value of the concentration and volume of NaF in equation (1):
(2.4)× (1.7) = M₂ × (3.3)
M₂ = 1.24 M
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A gas evolved during a chemical reaction and has a volume of 651 mL at 38 °C and 869 torr. What was the volume of this gas in mL at 110 °C and 3.87 atmospheres?
Just put in the number. The assumption is the unit is mL.
1 atm = 760 torr = 760 mmHg = 101,325 pa = 101.325 kpa = 1.01325 barr = 14.696
p.s.i. = 29.921 inHg
(inHg and p.s.i. are approximations of the metric pressures and are subject to significant figures)
A gas evolved during a chemical reaction and has a volume of 651 mL at 38 °C and 869 torr. the volume of this gas in mL at 110 °C and 3.87 atmospheres was 238 mL.
given that :
volume V1 = 651 mL
temperature T1 = 38 °C = 38 + 273 = 311 K
pressure P1 = 869 torr = 1.14 atm
pressure P2 = 3.87 atm
temperature T2 = 110 °C = 110 + 273 = 383 K
volume V2 ?
using ideal gas equation , we get :
P1 V1 / T1 = P2 V2 / T2
(1.14 × 651 ) / 311 = (3.87 × V2 ) / 383
2.38 = 0.010 V2
V2 = 238 mL
Thus, A gas evolved during a chemical reaction and has a volume of 651 mL at 38 °C and 869 torr. the volume of this gas in mL at 110 °C and 3.87 atmospheres was 238 mL.
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1. What is the new volume of a gas if 50 mL at 81.0 kPa has its pressure increased to 101.3 kPa? (Temperature is constant)
The new volume of a gas 40ml, if 50 mL at 81.0 kPa has its pressure increased to 101.3 kPa.
What is Boyle's Law?
Boyle's law is a gas law that states that the pressure exerted by a gas (with a given mass and constant temperature) is inversely proportional to its volume. In other words, as long as the temperature and amount of gas remain constant, the pressure and volume of a gas are inversely proportional to each other. Boyle's law was proposed in 1662 by the Anglo-Irish chemist Robert Boyle.
Any change in the volume occupied by a gas (at constant quantity and temperature) results in a change in the pressure exerted by it, according to Boyle's law.
In other words, the product of a gas's beginning pressure and volume is equal to the product of its end pressure and volume (at constant temperature and number of moles).
P1V1 = P2V2
Where,
P1 denotes the gas's initial pressure.
V1 denotes the gas's initial volume.
P2 denotes the gas's final pressure.
V2 denotes the gas's final volume.
The pressure-volume relationship provided by Boyle's law can be used to get this phrase. PV = k for a fixed amount of gas kept at a constant temperature. Therefore,
P1V1 = k (starting pressure * starting volume)
P2V2 = k (last pressure * last volume)
∴ P1V1 = P2V2
According to Boyle's Law
p1v1=p2v2
81x50= 101.3xv2
v2 = 140ml
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4. A student performed a steam distillation of toluene and water and observed that the mixture boiled at
84.5 °C, The student collected the distillate in a graduated cylinder that was at room temperature (25°C)
The distillation was stopped after 2.0 mL of water had been collected. At first, the student was surprised
to see how much toluene had been collected, but after performing some calculations, the student realized
that it made sense. What volume of toluene had been collected? Show your work
The volume of toluene had been collected is 79.8L
Steam distillation is a process used for the recovery of volatile compounds with high boiling points and from inert and complex matrices solid and liquid using saturated or superheated steam as separation and energy agent
Here a student performed a steam distillation of toluene and water
So we have to calculate the volume of toluene = ?
So density = mass/volume
Rearranging the formula
Volume = mass × density
So mass of toluene = 92.14g/mol
Density of toulene = 867kg/m³
So Volume = mass × density
Volume = 92.14g/mol×867kg/m³
Volume = 79.8L
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As a pathologist, Joachim is responsible for performing autopsies. What does this MOST likely mean for Joachim?
A.
He spends hours trying to match fingerprints to a database.
B.
He compares bullets to guns to see if he can find a match.
C.
He dissects human bodies to determine how someone died.
D.
He uses insects to learn when a person most likely died.
As a pathologist, Joachim is responsible for performing autopsies which means that he will most likely be involved in dissecting human bodies to determine how someone died and is denoted as option C.
What is Autopsy?
This is referred to as a surgical procedure which involves the thorough examination of a dead body by dissection to determine the cause and manner of death so as to know next line of action.
As a pathologist, the bodies have to be cut open and carefully analyzed so as to ensure that the cause of death is determined and also helps to solve crime cases during investigations.
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There are 4.9875 mol C, 7.9802 mol H,
and 2.00 mol O in the sample.
Divide each by the smallest number of
moles. What is the ratio for the C?
Do not round your answer
2.48925 C : ? H : ? O
The ratio of the carbon to the rest of the atoms in the compound would be 2.49375 to 3.9901 of hydrogen, and 1.00 of oxygen.
The ratio of atoms in a compoundThe ratio of an atom to the rest of the atoms in a compound can be determined by knowing the empirical or molecular formula of the compound.
Now, the compound in question contains C, H, and O.
Amount of C = 4.9875 molAmount of H = 7.9802 molAmount of O = 2.00 molLet's divide the mol f each atom by the mol of the smallest. the smallest in this case is 2.00 moles.
C = 4.9875/2.00 = 2.49375
H = 7.9802/2.00 = 3.9901
O = 2.00/2.00 = 1.00
Thus, the ratio for carbon is 2.49375 to 3.9901 of hydrogen, and 1.00 of oxygen.
The empirical formula of the compound is [tex]C_2H_4 O[/tex].
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The ratio of C if 4.9875 mol C, 7.9802 mol H, and 2.00 mol O are present in the sample is 2.5.
How to calculate empirical ratio?Empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.
The empirical ratio to derive the empirical formula can be calculated by dividing the number of moles of each element by the smallest value.
According to this question, there are 4.9875 mol C, 7.9802 mol H, and 2.00 mol O in the sample. The smallest mole is 2 moles.
C = 4.9875mol ÷ 2 = 2.4938H = 7.9802 mol ÷ 2 = 3.9901O = 2 mol ÷ 2 = 1Therefore, the empirical ratio of carbon in the compound is 2.5.
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6 The pressure of 8.06 L of an ideal gas in a flexible container is decreased to
one-third of its original pressure, and its absolute temperature is decreased by
one-half. What is the final volume of the gas?
The pressure of 8.06 L of an ideal gas in a flexible container is decreased to one-third of its original pressure, and its absolute temperature is decreased by one-half and the final volume of gas is 12.09 L
The volume of gas in a flexible container is 8.06 L
The pressure is P1=X atm
Temperature is T1=YK
Let us calculate the volume V2 if Pressure P2=X/3 atm
Temperature T2=Y/2 K
Using the ideal gas equation, we get
P1V1/T1=P2V2/T2
V2=V1P1T2/T1P2
V2=8.06LX atm×Y/2K/YK.X/3 atm
V2=8.06x3/2
V2=12.09 L
The combined gas law is an amalgamation of the three previously known laws which are- Boyle's law PV = K, Charles's law V/T = K, and Gay-Lussac's law P/T = K.Applications of the combined gas law exist. This rule is applicable when the pressure, volume, and temperature are constant but the quantity of gas varies. The law can predict things like cloud formation, refrigerators, and air conditioners, for instance.To learn more about combined gas law visit:
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How many oxygen atoms are
present in one mole of
dinitrogen pentoxide?
N2O5
1.20 x 10^24
3.01 x 10^24
4.21 x 10^24
6.02 x 10^23
There are 5 oxygen atoms in one nitrogen pentoxide. The number of oxygen atoms in one mole of nitrogen pentoxide is 3.01 × 10²⁴.
What is one mole?Any substance containing 6.022 × 10²³ atoms is called one mole of the substance. This number is called Avogadro number. Hence, one mole of every element contains Avogadro number of its atoms.
One mole oxygen contains 6.022 × 10²³ oxygen atoms. Similarly one mole of a compound contains 6.022 × 10²³ number of its constituent molecules.
Now, the number of oxygen atoms in one mole of N₂O₅ will be 6.022 × 10²³ × 5 = 3.01 × 10²⁴. Therefore, option b is correct.
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Mole measure the number of elementary entities of a given substance that are present in a given sample. 6.02 x 10²³ oxygen atoms are
present in one mole of dinitrogen pentoxide N[tex]_2[/tex]O[tex]_5[/tex]. The correct option is option 4.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance.
One mole of any substance contains 6.02 x 10²³ number of atoms. 6.02 x 10²³ is called Avogadro number. Mole is inversely proportional to Avogadro number.
Therefore, 6.02 x 10²³ oxygen atoms are present in one mole of dinitrogen pentoxide. The correct option is option 4.
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2. When 47.5 J of heat are added to 13.2 g of a liquid, its temperature rises by 1.72 °C. What i
the heat capacity of the liquid?
answer : 2.02 J/g°C
Answer:
Below
Explanation:
specific heat cap = j / (gm c)
= 47.5 / (13.2 *1.72) = 2.09 j / (gm-c) or = 2093 j/(kg-C)
Heat capacity = 47.5 / 1.72 = 27.6 J / C
Write the charge and full ground-state electron configuration of the monatomic ion most likely to be formed by Se.
The ground state electron configuration for the monoatomic ion is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.
What is a monoatomic ion?A monoatomic ion is an ion that contains only one atom. We can be able to form an ion by the addition or by the removal of an electron from the atom. We form a positive ion by the removal of an electron and we form a negative ion by the addition of an electron.
Now we have the element that is called selenium (Se) the ion that is formed by this element is Se^2-. Selenium is able to form a monoatomic ion when it gains two electrons. The electron configuration of this ion is; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.
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It takes a sample of CO₂ 23.3 seconds escape from a container. How long will it
take the same volume of NO₂(g) to escape from the same container?
Please show how to solve!!
It takes a sample of CO₂ 23.3 seconds escape from a container. it will take the same volume of NO₂(g) to escape from the same container is 23.4 sec.
The effusion rate gas is inversely proportional to the square root of molecular mass.
Rate ∝ √1/M
for the same volume of gases,
t1 / t2 = √ M1 / M2
molar mass of CO₂ = 44 g/mol
molar mas of NO₂ = 46 g/mol
23.3 / t2 = √ 44 / 46
23.3 / t2 = 6.6 / 6.7
23.3 / t2 = 0.9
t2 = 23.4 sec
Thus, It takes a sample of CO₂ 23.3 seconds escape from a container. it will take the same volume of NO₂(g) to escape from the same container is 23.4 sec.
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what is the most reactive alien metal? alien periodic table answers
The most reactive alien metal are: bazinga (Bz) , minajine (Mdj) , madmenium (Mlr) and Dancingstar (Ds).
The metalloid from space is what?When newly prepared, polished, or shattered, a metal exhibits a shiny look and quite good electrical and thermal conductivity. Typically, metals are malleable and ductile. The metallic link formed by the atoms or molecules of the metal gives rise to these characteristics.
Therefore, Ernst (E), highho (Hi), terriblum (T), and sississ are the metalloids (Ss). Sississ has the largest atomic mass of any metalloid. Ernst has the lowest atomic mass of any metalloid. Group 14 includes Highho and Terriblum.
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If I take my break at 3:48 and break our 30 mins what time is my break over
Answer:
Your break would end at 4:18
Explanation:
which of the following environmental effects is influenced by magnetic field strength
Which of the following equilibrium constants indicates the reaction that gives the greatest amount of reactant? (most reactant favored)
Kc = 5 x 10^-10
Kc = 5 x 10^-1
Kc = 5 x 10^0
Kc = 5 x 10^1
Kc = 5 x 10^10
5 ×10^-10 equilibrium constants indicates the reaction that gives the greatest amount of reactant.
At equilibrium, the forward and reverse reaction rates are equal, resulting in constant concentrations for all of the chemicals. Given that, it seems sense that the ratio of concentration for any given reaction at equilibrium will always keep a constant value.
The ratio of the mathematical product of a reaction's products to that of the concentrations of its reactants is known as the equilibrium constant (Keq). The balanced chemical equation raises each concentration to the power of its corresponding coefficient. K=1 when equilibrium attains. It has no units.
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If you have 257.4 mL of a 0.7280 M potassium carbonate solution and you need 500.0 mL of a 0.2250 M potassium carbonate solution, how much concentrated solution?
The amount of the concentrated solution and water needed would be 154.5 mL and 345.5 mL respectively.
Dilution problemThe problem here can be solved using the simple dilution equation that is expressed as:
[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex]
Where [tex]m_1[/tex] is the molarity of the undiluted solution, [tex]v_1[/tex] is the volume of the underlined solution needed, [tex]m_2[/tex] is the molarity of the solution to be prepared, and [tex]v_2[/tex] is the volume of the solution to be prepared.
In this case:
[tex]m_1[/tex] = 0.7280 M
[tex]v_1[/tex] = ?
[tex]m_2[/tex] = 0.2250
[tex]v_2[/tex] = 500.0 mL
Rearranging the equation to make [tex]v_1[/tex] the subject:
[tex]v_1[/tex] = [tex]m_2v_2/m_1[/tex]
Now, let's substitute the values:
[tex]v_1[/tex] = 0.2250 x 500.0/0.7280
= 154.5 mL
This means the volume of the concentrated solution needed is 154.5 mL out of 257.4 mL available. Since our final volume is 500.0 mL, the 154.5 mL stock solution will be made up to 500 mL with water.
Thus, the amount of water required would be:
500.0 - 154.5
= 345.5 mL
In other words, the volume of the concentrated solution needed is 154.5 while the volume of water needed is 345.5 mL.
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The complete question: If you have 257.4 mL of a 0.7280 M potassium carbonate solution and you need 500.0 mL of a 0.2250 M potassium carbonate solution, how much concentrated solution and how much distilled water do you need?
At which of the following temperatures will gas particles have the slowest root mean-squared speed?
63c
25c
54c
19c
The speed that reflects the average kinetic energy of the molecules is known as the root-mean-square speed. using N2 at 25 °C.
Does root mean square speed vary with temperature?The square root of temperature and the square root of the molar mass are both exactly proportional to the rms velocity. Thus, doubling the rms velocity of the molecules when the temperature of a specific gas is quadrupled.
What is the root mean square temperature?The root mean square velocity of gaseous hydrogen molecules equals that of oxygen molecules at 47°C at what temperature.
A gas will effuse more quickly the lighter it is; conversely, the heavier a gas is ,the slower it flows, the more. Helium (He) will have the highest rate of effusion since it has the lowest molecular weight (atomic weight, in this example).
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Complete the following table
(H3O+) 2.0x10^-6 (OH-) ?
The value of hydroxide ion concentration, [OH⁻] in the table, given that [H₃O⁺] is 2.0×10⁻⁶ M, is 5.0×10⁻⁹ M
How do I determine the value of [OH⁻]?From the defininion of pH, we understood that the relationship between hydronium ion, H₃O⁺ and hydroxide ion, OH⁻ in a solution is given as:
[H₃O⁺] × [OH⁻] = 10¯¹⁴
With the above formula, we can determine the value of the hydroxide ion, OH⁻. Details below:
Hydronium ion concentration [H₃O⁺] = 2.0×10⁻⁶ MHydroxide ion concentration [OH⁻] =?[H₃O⁺] × [OH⁻] = 10¯¹⁴
2.0×10⁻⁶ × [OH⁻] = 10¯¹⁴
Divide both side by 2.0×10⁻⁶
[OH⁻] = 10¯¹⁴ / 2.0×10⁻⁶
[OH⁻] = 5.0×10⁻⁹ M
Thus, we can conclude that the hydroxide ion concentration, [OH⁻] is 5.0×10⁻⁹ M
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Example 1:
A student dissolves 5.00 g of CaCl₂ into 200.0 g of H₂O. The temperature changes from 25.0°C to 28.0°C.
1.Calculate q surr
a. Find mass of solution (solute + solute).
b. Calculate heat of surroundings q = MCAT. Convert to KJ.
2520 joule is the heat (q) when a student dissolves 5.00 g of CaCl₂ into 200.0 g of H₂O. The temperature changes from 25.0°C to 28.0°C.
H₂O mass=200.0 g
c of H₂O= 4.2 joules per gram
Δt=3 °C
q=mcΔt
q=200.0 g×4.2×3
q=2520 joule
mass of solution= (solute + solute)
mass of solution=5.00 g+200.0 g
mass of solution=700 g
Heat has a very precise meaning in thermodynamics that is distinct from how we typically use the word. Heat is the thermal energy that is transmitted when two systems with different surface temperatures come into contact. Heat is denoted by the letters q or Q and is measured in Joules.
Because it is defined in the context of a process through which energy can be transmitted, heat is occasionally referred to as a process quantity. We don't discuss the heat that a cup of coffee contains, but we may discuss the heat that the cup of hot coffee transfers to your hand. Another significant characteristic is heat.
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What is the formula to determine the mass in grams of 3.6 moles of H2SO4
The formula to find the mass in grams is = number of moles × Molecular mass
A mole is defined as 6.02214076 × 1023 of the chemical unit, be it atoms, molecules, ions, or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others that are present in any substance.
To find number of moles we use the formula that is weight divided by molecular mass
From this we can find out the mass as well;
Mass = Number of moles × Molecular mass
Mass = 3.6 × 98.070 ⇒ 353.08 grams
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Calculate the concentration (in molarity) of an NaH solution if 25.0 mL of the solution is needed to neutralize 19.7 mL of a 0.463 M HCI solution.
Answer:
0.11 m
Explanation:
H Ci + NaOH H2 O+ NaC1
by titration
0.0025 L of 0.13 mol Na OH = 0.00325 Mol NaOH
L
0.00325 Mol NaOH 1 Mol Hcl/I Mol NaOH = 0.00325 Mol hcl
now 0.00325 mol Hcl/ 0.030 L = 0.0108 M hcl
The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent. A 7.97 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3+(aq). The Sb3+(aq) is completely oxidized by 34.8 mL of a 0.130 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is
BrO−3(aq)+Sb3+(aq)⟶Br−(aq)+Sb5+(aq)(unbalanced)
Calculate the amount of antimony in the sample and its percentage in the ore.
mass of antimony in grams:
percentage of antimony:
The mass of antimony present in the sample is 1.65 g
The percentage mass of antimony in the sample is 20.7%.
What moles of antimony is present in the sample?The number of moles of antimony present in the sample is determined from the mole ratio of the reaction.
The mole ratio of the reaction is obtained from the balanced equation of the reaction as follows:
Balanced equation of the reaction:
BrO₃⁻ (aq) + 3 Sb³⁺ (aq) + 6 H⁺ ⟶ Br⁻ (aq) + 3 Sb⁵⁺ + 3 H₂O
moles of KBrO₃ in the 34.8 mL of a 0.130 M aqueous solution of KBrO₃ is determined as follows:
Moles = molarity * volume in litersMoles of KBrO₃ = 0.13 * 34.8/1000
Moles of KBrO₃ = 0.004524 moles
1 mole of KBrO₃ reacts with 3 moles of Sb³⁺
Moles of Sb³⁺ reacted = 0.004524 * 3
Moles of Sb³⁺ reacted = 0.13572 moles
The mass of antimony present = moles * molar mass
Molar mass of antimony = 121.76 g/mol
Mass of antimony = 121.76 * 0.13572
Mass of antimony = 1.65 g
Percentage mass of antimony = (1.65/7.97) * 100%
Percentage mass of antimony = 20.7%
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.The isothermal compressibility of lead at 293 K
The pressure that must be applied to increase the dentisy by 0.10% is 453.48 atm.
What is isothermal compressibility?It's important to note that isothermal compressibility simply means the fractional differential change that can be seen in the volume as a result if the change in pressure.
It should be noted that the isothermal compressibility formula will be:
= 1/v (dv/dp)
where v = volume
p = pressure
dv = 0.10% = 0.001
This will be:
2.21 × 10^(-6) = 0.001/dp
dp = 0.001 / 2.21 × 10^(-6)
dp = 452.48 atm
New pressure = 1 atm + 452.48 atm
= 453.48 atm
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Complete question
The isothermal compressibility of lead at 293 K. Calculate the pressure that must be applied to increase the dentisy by 0.10%.
The mass of Jupiter is 0.001Ms or 0.001 solar masses. Some people have said that Jupiter is the star that might have been. Would you agree or disagree? What evidence can you discuss to help you prove your point to this group of people?
We cannot predict whether a spatial object is a star or a planet based on just its mass. However, Jupiter is already proven to be a planet which revolves around the sun. Thus we can't agree to the statement.
What are stars?Stars are spatial things with light energy formed by gases and dust particles. They are stationary at a position in the universe. They can form groups with other stars called constellations in various shapes which are connected by the force of attraction.
Planets are revolving around a star such as in solar system, where, 8 planets including earth and Jupiter. Jupiter is the biggest planet in the solar system and it is not star.
Therefore, Jupiter is not a star and the statement is false.
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Calculate the molarity of 23.5 g of NaOH in 400. mL of an NaOH solution.
Answer:
1.468 M
Explanation:
When sodium metal is placed in a flask full of chlorine gas, a violent reaction occurs. These dangerous non-charged elements, when mixed, produce the ionic compound sodium chloride, otherwise known as table salt. Explain how this happens in terms of nuclei, electrons, and charges.
In the formation of the sodium chloride, there is the loss of one electron from the sodium atom to the chlorine atom.
What is an ionic bond?An ionic bond is the kind of bond that is formed between a metal and a non metal. The metal is known to donate electrons to the non metal. In the actual sense, the compound that is formed is an ion pair because the metal is positively charged while the non metal is negatively charged.
In the case of the sodium chloride, we know that the both elements, sodium and chlorine are highly reactive. Hence the sodium atom would quickly loose electrons to the chlorine atom and then the sodium chloride compound is formed.
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Consider a weak base equilibrium as shown in the equation below. What is the effect on Kb if BH⁺ were added to the solution?
B (aq) + H2O (l) ⇌ BH⁺ (aq) + OH⁻ (aq)
A weak base equilibrium as shown in the equation below. the effect on Kb if BH⁺ were added to the solution; the equilibrium constants is remains unchanged.
The equation is given as :
B (aq) + H2O (l) ⇌ BH⁺ (aq) + OH⁻ (aq)
K = [ BH⁺ ] [ OH⁻] / [B]
the equilibrium constant for the given reaction is remain unchanged. the equilibrium constant will only depends on the temperature of the reaction.
Thus, A weak base equilibrium as shown in the equation below. the effect on Kb if BH⁺ were added to the solution; the equilibrium constants is remains unchanged.
B (aq) + H2O (l) ⇌ BH⁺ (aq) + OH⁻ (aq)
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A 0.7256 g mixture of KCN ( MW=65.116 g/mol ) and NaCN ( MW=49.005 g/mol ) was dissolved in water. AgNO3 was added to the solution, precipitating all of the CN− in solution as AgCN ( MW=133.886 g/mol ). The dried precipitate weighed 2.5874 g. Calculate the weight percent of KCN and NaCN in the original sample.
The weight percent of KCN and NaCN in the original sample are;
weight percent of KCN = 57%weight percent of NaCN = 43%What is the weight percent of KCN and NaCN in the original sample?The weight percent of KCN and NaCN in the original sample is calculated as follows:
The mass of the original mixture of KCN and NaCN = 0.7256 g
The dissociation equation of the ionic compounds in an aqueous solution is given below:
KCN ⇄ K⁺ + CN⁻
NaCN ⇄ Na⁺ + CN⁻
Mass of precipitate of AgCN = 2.5874 g
Moles of AgCN in a 2.5874 g sample = mass / molar mass
molar mass of AgCN = 133.886 g/mol
Moles of AgCN in the sample = 2.5874 / 133.886
Moles of AgCN in the sample = 0.01932 moles
Moles of CN⁻ in the sample = 0.01932 moles
Mass of CN⁻ present in the sample = 0.01932 * 26
Mass of CN⁻ present in the sample = 0.50232 g
Moles of Na⁺ present = 0.01932 / 2 moles
Moles of Na⁺ present = 0.009663 moles
Mass of Na⁺ present = 0.00966 * 23
Mass of Na⁺ present = 0.2222 g
Moles of K⁺ present = 0.01932 / 2 moles
Moles of K⁺ present = 0.00966 moles
Mass of K⁺ present = 0.009663 * 39
Mass of K⁺ present = 0.3768 g
Mass of sample = 0.50232 g + 0.2222 g + 0.3768 g
Mass of sample = 1.10132 g
weight percent of KCN = (0.3768 + 0.50232/2)/1.10132 * 100%
weight percent of KCN = 57%
weight percent of NaCN = (100 - 57)%
weight percent of NaCN = 43%
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When 2 moles of H₂S(g) react with
O₂(g) to form H₂O(g) and SO₂(g)
according to the following equation,
1.04×10³ kJ of energy are evolved.
2H₂S(g) + 30₂(g)→→→→→→
2H₂O(g) + 2SO₂(g)
Is this reaction endothermic or
exothermic?
What is the value of q?
kJ
The reaction is exothermic in nature and the value of q in kJ is -1.12x10^3 kJ
The reaction is 2H₂S(g) + 3O₂(g)→→→→→→2H₂O(g) + 2SO₂(g)
The amount of heat evolved in the reaction = 1.12 X 103 KJ
2 moles of hydrogen sulphide react.
In an is In an endothermic reaction, energy is consumed. an exothermic reaction, energy evolved Thus, the given reaction is exothermic.
Exothermic reactions are those reactions in which the energy is evolved or released by the reaction.
And endothermic reactions are those reactions in which heat or energy is absorbed in the reaction.
Since the reaction is evolving energy.
Hence the reaction is an exothermic reaction.
The value of q is defined as the amount of heat transferred to the system.
Since the heat is going away from the system.
Hence the value of q will be -ve.
And the magnitude of q will be exactly the same as the amount of heat evolved by the reaction.
Hence q = -1.12 X 103 KJ (-ve sign shows that heat is being evolved i.e exothermic process)
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please help!
For the reaction:
2H2 (g) + O2 (g) —-> 2H2O (l)
calculate the change S of system and the change of S of surroundings
+571.6 KJ and 1803.03 J/K are the entropy (S) of system and the change of S of surrounding.
2H2O(l) --->2H2(g) + O2(g)
first step is to get dHrxn = dHf(Products) - dHf(reactants)
take dHf of reactants and products from standard thermodynamic table
dHf(H2O) = -285.8 KJ/mol
dHf(H2) =0 kj/mol
dHf(O2)= 0 kj/mol
dHrxn = 2dHf(H2) + dHf(O2) - 2dHf(H2O)
= 2*0 + 0 - 2 [-285.8] kj = +571.6 KJ
this is for 2 mole of H2O
for 1.88 mols H2O, dHrxn = +571.6 KJ/2mol×1.88 mol = 537.304 kj
T =298 K
dS surrounding = - dHrxn/T = -537304 j/298 K = -1803.03 J/K
Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive labor. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.
In an isolated system—one that does not exchange heat or work with its surroundings—spontaneous change for an irreversible process always moves in the direction of rising entropy, according to the Clausius form of the second law. For instance, the ice block and the stove are two components of a standalone system for which the overall entropy rises as the ice melts.
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