Answers
Answer:
2.5M
Explanation:
First calculate the gram-formula mass of CaCO3 (add up the mass of each element in the compound)
40.1 + 12.01 + 16(3) = 100.11
Now use the mole calculation equation on Table T and plug in the numbers
(Keep in mind that 25 is the given mass)
25/100.11 = 2.497 or 2.5M
Related Questions
The picture shows two containers filled with a gas.
Which statement is correct?
The average kinetic energy of the gas particles is greater in container A because it has a lower temperature.
The average kinetic energy of the gas particles is greater in container B because it has a higher temperature.
The gas particles in both containers have the same average kinetic energy because they have the same volume.
The gas particles in both containers have the same average kinetic energy because they have equal number of particles.
Answers
Answer: The average kinetic energy of the gas particles is greater in container B because it has a higher temperature.
Question 2
2C4H10 + 1302 -> 8CO2 + 10H₂O
If 2.46 g H₂O are produced by a reaction, how many moles of C4H10 were used?
Answers
Answer:
2 mole of C4H10 were used in this reaction.
In the following acid-base reaction
H₂O is the _
HCI(g) + H₂O(l) →H3O*(aq) + Cl-(aq)

Answers
Answer: base
Explanation:
The water accepted another hydrogen ion, making it a base.
In the given acid-base reaction, H₂O (water) is the base because it accepts a proton (H+) from the hydrogen chloride (HCl) molecule and forms hydronium ion (H₃O+) by gaining an extra proton.
What is an acid- base reaction ?An acid-base reaction is a chemical reaction in which an acid reacts with a base to form a salt and water. In such a reaction, the acid donates a proton (hydrogen ion) to the base, which accepts the proton. The transfer of a proton from the acid to the base leads to the formation of the conjugate base of the acid and the conjugate acid of the base.
In general, an acid is a substance that donates a proton (H+) and a base is a substance that accepts a proton. When an acid and a base react, the resulting products are a conjugate acid-base pair, where the acid is the product that has gained a proton and the base is the product that has lost a proton.
In the given acid-base reaction, H₂O (water) is the base because it accepts a proton (H+) from the hydrogen chloride (HCl) molecule and forms hydronium ion (H₃O+) by gaining an extra proton.
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What is the equilibrium constant of a reaction?
A. It is the concentrations of products multiplied by the
concentrations of reactants.
о
B. It is the number of moles of reactants subtracted from the number
of moles of products.
C. It is the ratio of the concentrations of products to the
concentrations of reactants.
D. It is the ratio of the number of moles of products to the number of
moles of reactants.
Answers
Answer:
C. It is the ratio of the concentrations of products to the
concentrations of reactants.
Explanation:
a sample of wood that originally contained 100 grams of carbon14 now contains only 25 grams of carbon 14. approximately how many years ago was this sample part of a living tree
Answers
11460 years ago a sample of wood was the part of a living tree.
What is half-life?The time required for half of something to undergo a process.
Carbon-14 has a half-life of 5,730 years. That means that no matter how many carbon-14 atoms were present when something died, after 5,730 years only half of them are left the rest have decayed to nitrogen.
The half life of C-14 is [tex]t_{\frac{1}{2}}[/tex] =5730 years.
This means that if you start with a sample of 100g, only 50g will be left in 5730 years.
Here, Only 25g is left, therefore the number of years is =5730 × 2 = 11460years.
Hence, 11460 years ago a sample of wood was the part of a living tree.
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Do taller people have longer arms that shorter people? Find the dependent variable, independent variable and state your hypothesis. PLS HELP
Answers
Answer:
A hypothesis is a testable statement that is proposed to explain an observation/theory. In this case, one hypothesis that could be used is: Taller people have longer arms than smaller people. You could also say: As the height of an individual increases, the length of their arms also increases.
Independent variables are the variable that is manipulated. In this case, the independent variable is the height of the individual.
Dependent variables are those that change in response to the independent variable. In this case, the dependent variable is arm length.
What will happenhappen to the pressure of a gas if its Container's volume decreases .
Answers
Answer: The pressure will increase.
Explanation:
Boyle's law states that "the volume of a gas at constant temperature varies inversely with the pressure exerted on it." In other words, if there is more volume for the gas to spread, the pressure will decrease.
This also goes the opposite way, meaning with less volume the pressure will increase.
Which of these is a benefit of including comments in your code
makes the app run faster
O helps other programmers understand your code
O improves the user interface
O makes your app more user friendly
Answers
A benefit of including comments in your code is that it helps other programmers understand your code.
What is a Code?These are numbers and letters which are used to identify a particular thing at a point in time.
Comments can be put in a code so as to enable others know and understand real intentions about it etc.
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Answer: O helps other programmers understand your code
Explanation: got it right on edgen
when we send electricity to pass through electrolysis jar we see gas bubble around both electrodes. Water electrolysis produces 46cm3 at anode.
A). What gas does it appear at each electrode?
B). What would you do to identify the gas in the test tubes at each electrode?
C). Calculate the volume of gas which appears at cathode.
Answers
A) Anode - hydrogen gas
Cathode-oxygen gas
B) Hydrogen gas - The gas burns with a pop sound
Oxygen gas - The gas rekindles a glowing splint
C) The volume of gas produced at the cathode is 23 [tex]cm^3[/tex]
What is electrolysis?Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.
The electrolysis of water produces two volumes of hydrogen at the anode and one volume of oxygen at the cathode.
The hydrogen gas burns with a pop sound. It is easily identified by this test. Also, oxygen is known to rekindle a glowing splint and this is a commonly used test for oxygen gas.
Since the ratio of hydrogen produced at the anode to oxygen produced at the cathode is 2:1 by volume; then when 23 [tex]cm^3[/tex] of oxygen is produced at the cathode, 46 [tex]cm^3[/tex]of hydrogen is produced at the anode.
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What is Matter and give the examples
Answers
Answer:
Matter is a substance that has inertia and occupies physical space.
Matter is literately in everything
Explanation:
Examples of matter:
Your body
A home
The air
Things that are not matter are:
A light
Heat form fire
Sounds
There not matter because you cant touch, smell or taste them.
Answer:
matter is any substance that occupies space and has weight
Examples
solid,liquids and gas e.t.c
How many moles are in 2.372e+02 mg (milligrams) of bromic acid?
Answers
Answer:
1.840 x 10⁻³ mol HBrO₃
Explanation:
To find the moles of bromic acid (HBrO₃), you should (1) convert milligrams to grams (by dividing by 1,000) and then (2) convert moles to grams (via molar mass from periodic table).
Molar Mass (HBrO₃): 1.008 g/mol + 79.904 g/mol + 3(15.998 g/mol)
Molar Mass (HBrO₃): 128.906 g/mol
2.372 x 10² mg HBrO₃ 1 g 1 mole
---------------------------------x----------------x------------------ = 1.840 x 10⁻³ mol HBrO₃
1,000 mg 128.906 g
What is the formula for the carboxylic acid functional group?
OA. -CH3
OB. -COH
0 с. -соон
OD. -CO-
Answers
Answer: C
Explanation:
This is a fact.
The osmotic pressure of an aqueous solution of ammonium phosphate,
(NH4)3PO4 is 11.4 atm at 27 0C. If the density of this solution is 0.854 g/cm3,
calculate the freezing point the solution. Kf for water is 1.86 0C/m
Answers
Answer:
the freezeng point of solution is -12°c b/c it dencity is 0.854 formula =
Describe a chemical test for water-
Answers
Answer:
Anhydrous copper (II) sulphate is white because it has no water in it. When drops of water are added, copper (II) sulphate turns blue. This colour change can be used to detect the presence of water (or water vapour).
Can anyone please help me, the attachment is down below
Answers
Bubbling or fizzing is usually observed when a chemical reaction occurs and is denoted as option D.
What is a Chemical reaction?This occurs when one or more reactant form a new substance which is referred to as the product.
The bubbling or fizzing depicts effervescence which signifies that a new gaseous product has been formed.
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How is graphite structured?
A. Its carbon atoms are bonded to 3 other carbon atoms and are
structured in layers that can slip past each other.
B. Its carbon atoms are bonded to 3 other carbon atoms and are
structured in layers that cannot slip past each other.
C. Each carbon atom is surrounded entirely by lone pairs, which
is why the carbon atoms separate from each other to the paper
easily when writing.
D. Each carbon is bonded to four others making it very solid and
rigid.
Answers
Graphite is structured in a way that: (A). Its carbon atoms are bonded to 3 other carbon atoms and are structured in layers that can slip past each other.
Meaning of a graphiteA graphite can be defined as a crystalline form of carbon.
Graphite is so important to man as it is used in many industries and factories as well as many countries to produce different products that can help mankind.
Graphite structure is quite a complex one and it involve carbons that have three of its electrons bonded and one free.
In conclusion, Graphite is structured in a way that: Its carbon atoms are bonded to 3 other carbon atoms and are structured in layers that can slip past each other.
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an imaginary gas phase reaction, according to the equation below is carried out in a closed container. 3.5 moles of A and 3.5 moles of B is introduced in the container. Reaction is carried out at 31.70C and volume of the container is 9.3 L. Percent yield of this reaction is 86.8%. Calculate the pressure of the container after reaction took place. R =0.0821 L.atm/mol.K
A+ 2B → AB2
Answers
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How does the entropy change in the reaction 2C3H6(g) + 902(g) → 6CO2(g) +
6 H₂O(g)?
OA. It is impossible to tell.
B. The entropy increases.
C. The entropy is constant.
D. The entropy decreases.
Answers
Taking into account the definition of entropy, the entropy increases (option B).
What is EntropyEntropy can be interpreted as a measure of the random distribution of a system. In other words, the entropy S is a state function that measures the degree of molecular disorder of systems.
In this way, the change in entropy shows the change in molecular order that occurs in a chemical reaction. If the increase in entropy is positive, the products have a higher molecular disorder (higher entropy) than the reactants. On the other hand, when the increase is negative, the products are more ordered.
So, the entropy increases in the reaction if the total number of product molecules are greater than the total number of reactant molecules.
Entropy change in this caseIn this case, there are 12 moles of gaseous product, and 11 moles of gaseous reactant in the equation. This is, there are more moles in the products than in the reactants.
Therefore, the entropy increases (option B).
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A container holds a mixture of 3.01 x 1023 molecules of H₂ gas. 1.20 x 1024 molecules of CO₂ gas, and 1.50 x 10
24 molecules O₂. If the total pressure of the container is 1.00atm, what is the partial pressure of oxygen gas in
atmospheres?
O 5.00 x 10 ¹ atm
O 9.09 x 10-2 atm
O2.50 x 10 ¹ atm
O2.00 x 10-¹ atm
8 9
10 11
12 13 14
15 16 1
Answers
Answer:
.4998 atm ( rounded to .5 atm ) <===== not one of the answers listed
Explanation:
The partial pressure exerted by O2 is equal to the fraction that is O2 times the pressure
1.5 / ( 1.5 + 1.2 + .301 ) * 1 atm = .4998 atm
( 1) Are you sure it is ONE atm pressure in the container?
(2) IS the first answer supposed to be 5 x 10^-1 atm perhaps?
If a penny has 0.035 g of copper(I)oxide coating its surface, what volume of 0.1 M acetic acid should be
used to clean it?
Answers
Explanation:
Step 1: Data given
Mass of Copper oxide (CuO) = 0.035 grams
Molar mass CuO = 79.545 g/mol
Molarity acetic acid = 0.10 M
Step 2: The balanced equation
CuO + 2CH3COOH → Cu(CH3COO)2 + H2O
Step 3: Calculate moles CuO
Moles CuO = mass CuO / molar mass CuO
Moles CuO = 0.035 grams / 79.545 g/mol
Moles CuO = 4.4 *10^-4 moles
Step 4: Calculate moles CH3COOH
For 1 mol CuO we need 2 moles CH3COOH to produce 1 mol Cu(CH3COO)2 and 1 mol H2O
For 4.4 *10^-4 moles CuO we'll have 2 * 4.4 * 10^-4 = 8.8 *10^-4 moles
Step 5: Calculate volume of acetic acid
Volume acetic acid = moles acetic acid / molarity
Volume acetic acid = 8.8 * 10^-4 moles / 0.10 M
Volume acetic acid = 0.0088 L = 8.8 mL
We need 8.8 mL of acetic acid
Two moles of gas A spontaneously convert to 3 moles of gas b in a container where the temperature and pressure are held constant. The sample originally took up 13.9L of volume. What is the new volume of the products? Pls show work :)
Answers
At constant temperature and pressure, If the amount of gas increases to the given value, its volume also increases to 20.85L.
What is Avogadro's law?Avogadro's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules."
It is expressed as;
V₁/n₁ = V₂/n₂
Given the data in the question;
Initial amount of gas n₁ = 2molesInitial volume v₁ = 13.9LFinal amount of gas n₁ = 3molesFinal volume v₂ = ?V₁/n₁ = V₂/n₂
V₁n₂ = V₂n₁
V₂ = V₁n₂ / n₁
V₂ = (13.9L × 3moles) / 2moles
V₂ = 41.7molL / 2mol
V₂ = 20.85L
At constant temperature and pressure, If the amount of gas increases to the given value, its volume also increases to 20.85L.
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What is specific heat capacity?
If answer is correct I will mark as brainliest
Answers
Answer:
A. The energy required to completely melt 1 g of a substance.
Explanation:
Because the root definition for Specific Heat Capacity is basically the amount of heat that's absorbed per unit mass of whatever material when the temperature is increasing. Or in other words, the amount of heat that's taken out or supplied to the unit mass of a system in order to increase or decrease its temperature by one degree. Hope this helps :)
8B-Zisette, Jennifer
ping
Complete the sentence to describe what a wave is and what it does.
A wave is a
that carries
from one place to another.
Answers
Answer:
Disturbance; energy.
Explanation:
A wave is a disturbance that transfers energy from one place to another without transferring matter.
Enter your answer in the provided box.
A 4.80−g sample of a salt dissolves in 9.10 g of water to give a saturated solution at 27°C. What is the solubility (in g salt/100 g of H2O) of the salt?
Answers
The solubility (in g salt/100 g of H2O) of the salt is determined as 52.75 g salt.
Solubility of the salt in the waterThe solubility of the salt in the given volume of water and temperature is calculated as follows;
4.8/9.1 = x/100
9.1x = 100 x 4.8
9.1x = 480
x = 480/9.1
x = 52.75 g salt
Thus, the solubility (in g salt/100 g of H2O) of the salt is determined as 52.75 g salt.
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The weight of an object ____.
a) depends on its location
b) is not affected by gravity
c) is the same as its mass
d) is always the same
Answers
Explanation:
the. correct option is d
please please helpppp
if someone could give me the answer on how to balance this equation with explanation that would be great.
Ag2O → Ag + 0₂
thanks in advance
Answers
Explanation: The reason why we balance is to make sure that the number of atoms are conserved on both sides. Since the reactants side has 2 silver atoms and the product side only has one, we can tell that the equation isn’t balanced. It is also observable that oxygen isn’t balanced. We can just trial and error. We can start by adding a coefficient of 2 to Ag2O and see if we can balance the products side. By adding a 4 to the Ag the chemical equation is balanced. Both sides has 4 Ag atoms and 2 oxygen atoms
Convert 3.80 mol of KCI to grams?
Answers
Answer:
283 grams KCl
Explanation:
To convert form moles to grams, you need to find the molar mass of your compound. The molar mass can be calculated using the individual molar masses of each element in the compound. These values can be found on the periodic table.
Molar Mass (K) = 39.098 g/mol
Molar Mass (Cl) = 35.453 g/mol
Molar Mass (KCl) = 39.098 g/mol + 35.453 g/mol
Molar Mass (KCl) = 74.551 g/mol
Now that you know the molar mass, you want to multiply it by the moles of KCl. This is possible because the molar mass is actually a ratio representing the relationship of grams and moles. In KCl, there are 74.551 grams of KCl for every 1 mole of KCl. When you are multiplying, make sure you set the ratio up in a way that allows for the units to cancel out and leave grams as your final answer.
3.80 moles KCl 74.551 g
----------------------- x ------------------- = 283 grams KCl
1 mole KCl
The final answer should have 3 sig figs because the value the problem gave (3.80 mol) also has 3 sig figs.
How many moles of aluminum do 6.4×1024 aluminum atoms represent?
Answers
Answer:
11 moles Al
Explanation:
To find the amount of moles, you need to use Avogadro's number to convert the atoms to moles. Since the value you were given has 2 significant figures, the final answer should also have 2 sig figs.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
6.4 x 10²⁴ atoms Al 1 moles
---------------------------- x ------------------------------ = 10.6 moles Al
6.022 x 10²³ atoms
= 11 moles Al
An air mattress is filled with 0.55 moles of air. The air inside the mattress has a temperature of 295 K and an absolute pressure of 3.5 kilopascals. What is the volume of the air mattress?
The volume of the air mattress is
liters.
Answers
The volume of the air mattress in litres is 385 litres when absolute pressure was 3.5 kilopascals.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates to the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
P= 3.5 kPa
V=?
n= 0.55 moles of air
T= 295K
R= 8.314 (L kPa/mol K)
We use the constant rate of 8.314 because we are using kilopascals in this problem.
Using the equation:
PV=nRT,
V = [tex]\frac{0.55 \;moles \;X \;8.314 \;L \;k\;Pa/mol k \;X \;295 K}{3.5 \;kPa}[/tex]
V = 385.4132857 L.
Hence, the volume of the air mattress in litres is 385 litres.
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20.0 g of bromic acid, HBrO3, is reacted with excess HBr.
HBrO3 (aq) + 5 HBr (aq) → 3 H2O (l) + 3 Br2 (aq)
If 47.3 g of Br2 is produced, what is the percentage yield of Br2? Round your answer to the nearest whole percent.
Answers
After Rounding off The percentage yield is 64%
What is Percentage Yield ?It is the ratio of actual yield to theoretical yield multiplied by 100% .
It is given in the question
20.0 g of bromic acid, HBrO3, is reacted with excess HBr.
The reaction is
HBrO₃ (aq) + 5 HBr (aq) → 3 H₂O (l) + 3 Br₂ (aq)
Actual yield = 47.3 grams
Molecular weight of Bromic Acid is 128.91 gram
Moles of Bromic Acid = 20/128.91 = 0.155 mole
Mole fraction ratio of Bromic Acid to Bromine is 1 :3
Therefore for 0.155 mole of Bromic Acid 3 * 0.155 = 0.465 mole of Bromine is produced.
1 mole of Bromine = 159.8 grams of Bromine
0.465 of Bromine = 74.31 grams of Bromine
Percentage Yield = (47.3/74.31)*100 = 63.65 %
After Rounding off The percentage yield is 64% .
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