Question 1

A 792 mg sample of a gas containing only sulfur and oxygen occupies a volume of 372 mL at 54°C and 678 mmHg.Identify the gas in the sample.(R = 0.08206 L.atm/K.mol)

Accepted Answer

A) SO 
B) SO2 
C) SO3 
D) S2O 
E) S2O2 
A) SO 
B) SO2 
C) SO3 
D) S2O 
E) S2O2

Question 2

What volume (L)of H2 is formed at STP when 6.0 g of Al is treated with excess NaOH?
2NaOH + 2Al + 6H2O $\rarr$ 2NaAl(OH)4 + 3H2(g)

Accepted Answer

Question 3

At what temperature will a sample of nitrogen gas with a volume of 328 mL at 15°C and 748 mmHg occupy a volume of 0.898 L at a pressure of 642 mm Hg? Assume the amount of the nitrogen gas does not change.

Accepted Answer

A) 676°C 
B) 404°C 
C) 396°C 
D) 274°C 
E) 123°C 
A) 676°C 
B) 404°C 
C) 396°C 
D) 274°C 
E) 123°C

Question 4

Gases are sold in large cylinders for laboratory use.What pressure, in atmospheres, will be exerted by 2,500 g of oxygen gas (O2)when stored at 22°C in a 40.0 L cylinder?

Accepted Answer

A) 3.6 atm 
B) 10.atm 
C) 47 atm 
D) 1,500 atm 
E) 7.6 × 104 atm 
A) 3.6 atm 
B) 10.atm 
C) 47 atm 
D) 1,500 atm 
E) 7.6 × 104 atm

Question 5

What will happen to the height (h)of the mercury column in the manometer shown below if the stopcock is opened, given that the atmospheric pressure is 755 mmHg?

Accepted Answer

A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question 
A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question

Question 6

The following data describes an initial and final state for an ideal gas.Given that the amount of gas does not change in the process, what is the final temperature (°C)of the gas?

Accepted Answer

The answer of The following data describes an initial and...

Question 7

What is the pressure of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 736 mmHg and h = 9.2 cm?

Accepted Answer

A) 92 mmHg 
B) 644 mmHg 
C) 736 mmHg 
D) 828 mmHg 
A) 92 mmHg 
B) 644 mmHg 
C) 736 mmHg 
D) 828 mmHg

Question 8

What is the pressure (in atmospheres)of the sample of gas trapped in the closed-tube mercury manometer shown below if h = 23.6 cm?

Accepted Answer

The answer of What is the pressure (in atmospheres)of the...

Question 9

What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?

Accepted Answer

A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question 
A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question

Question 10

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?

Accepted Answer

A) 8 
B) 2 
C) 1/2 
D) 1/4 
E) 1/8 
A) 8 
B) 2 
C) 1/2 
D) 1/4 
E) 1/8

Question 11

How many liters of oxygen gas at 153°C and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO3? (The other decomposition product is solid potassium chloride.)

Accepted Answer

A) 0.085 L 
B) 3.0 L 
C) 4.20 L 
D) 7.79 L 
E) 11.7 L 
A) 0.085 L 
B) 3.0 L 
C) 4.20 L 
D) 7.79 L 
E) 11.7 L

Question 12

A convenient way to produce very high purity oxygen in the laboratory is to decompose KMnO4(s)at high temperature according to the following chemical equation:
2KMnO4(s)$\rarr$K2MnO4(s)+ MnO2(s)+ O2(g)
If 2.50 L of O2(g)is needed at 1.00 atm and 20.°C, what mass (in grams)of KMnO4(s)should be decomposed? Assume the decomposition of KMnO4(s)goes to completion.

Accepted Answer

Question 13

A sample of a gas occupies 1.40 × 103 mL at 25°C and 760 mmHg.What volume will it occupy at the same temperature and 380 mmHg?

Accepted Answer

A) 2,800 mL 
B) 2,100 mL 
C) 1,400 mL 
D) 1,050 mL 
E) 700 mL 
A) 2,800 mL 
B) 2,100 mL 
C) 1,400 mL 
D) 1,050 mL 
E) 700 mL

Question 14

A small bubble rises from the bottom of a lake, where the temperature and pressure are 4°C and 3.0 atm, to the water's surface, where the temperature is 25°C and the pressure is 0.95 atm.Calculate the final volume of the bubble if its initial volume was 2.1 mL.

Accepted Answer

A) 0.72 mL 
B) 6.2 mL 
C) 7.1 mL mL 
D) 22.4 mL 
E) 41.4 mL 
A) 0.72 mL 
B) 6.2 mL 
C) 7.1 mL mL 
D) 22.4 mL 
E) 41.4 mL

Question 15

Calculate the volume occupied by 35.2 g of methane gas (CH4)at 25°C and 1.0 atm.R = 0.08206 L.atm/K.mol.

Accepted Answer

A) 0.0186 L 
B) 4.5 L 
C) 11.2 L 
D) 49.2 L 
E) 53.7 L 
A) 0.0186 L 
B) 4.5 L 
C) 11.2 L 
D) 49.2 L 
E) 53.7 L

Question 16

The temperature of a sample of argon gas in a 365 mL container at 740.mmHg and 25°C is lowered to 12°C.Assuming the volume of the container and the amount of gas is unchanged, calculate the new pressure of the argon.

Accepted Answer

A) 0.468 atm 
B) 0.931 atm 
C) 1.02 atm 
D) 1.54 atm 
E) 2.03 atm 
A) 0.468 atm 
B) 0.931 atm 
C) 1.02 atm 
D) 1.54 atm 
E) 2.03 atm

Question 17

Calculate the number of moles of gas contained in a 10.0 L tank at 22°C and 105 atm.(R = 0.08206 L.atm/K*mol)

Accepted Answer

A) 1.71 × 10-3 mol 
B) 0.0231 mol 
C) 1.03 mol 
D) 43.4 mol 
E) 582 mol 
A) 1.71 × 10-3 mol 
B) 0.0231 mol 
C) 1.03 mol 
D) 43.4 mol 
E) 582 mol

Question 18

The following data describes an initial and final state for an ideal gas.Given that the amount of gas does not change in the process, what was the initial volume (L)of the gas?

Accepted Answer

The answer of The following data describes an initial and...

Question 19

A 2.50-L flask contains a mixture of methane (CH4)and propane (C3H8)at a pressure of 1.45 atm and 20°C.When this gas mixture is then burned in excess oxygen, 8.60 g of carbon dioxide is formed.(The other product is water.)What is the mole fraction of methane in the original gas mixture?

Accepted Answer

A) 0.145 
B) 0.341 
C) 0.659 
D) 0.855 
E) 1.00 
A) 0.145 
B) 0.341 
C) 0.659 
D) 0.855 
E) 1.00

Question 20

A spacecraft is filled with 0.500 atm of N2 and 0.500 atm of O2.Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side.Under these circumstances,

Accepted Answer

A) O2 is lost from the craft 6.9% faster than N2 is lost. 
B) O2 is lost from the craft 14% faster than N2 is lost. 
C) N2 is lost from the craft 6.9% faster than O2 is lost. 
D) N2 is lost from the craft 14% faster than O2 is lost. 
E) N2 and O2 are lost from the craft at the same rate. 
A) O2 is lost from the craft 6.9% faster than N2 is lost. 
B) O2 is lost from the craft 14% faster than N2 is lost. 
C) N2 is lost from the craft 6.9% faster than O2 is lost. 
D) N2 is lost from the craft 14% faster than O2 is lost. 
E) N2 and O2 are lost from the craft at the same rate.

Exam 5: Gases

A 792 mg sample of a gas containing only sulfur and oxygen occupies a volume of 372 mL at 54°C and 678 mmHg.Identify the gas in the sample.(R = 0.08206 L.atm/K.mol)

What volume (L)of H2 is formed at STP when 6.0 g of Al is treated with excess NaOH? 2NaOH + 2Al + 6H2O →\rarr→ 2NaAl(OH)4 + 3H2(g)

At what temperature will a sample of nitrogen gas with a volume of 328 mL at 15°C and 748 mmHg occupy a volume of 0.898 L at a pressure of 642 mm Hg? Assume the amount of the nitrogen gas does not change.

Gases are sold in large cylinders for laboratory use.What pressure, in atmospheres, will be exerted by 2,500 g of oxygen gas (O2)when stored at 22°C in a 40.0 L cylinder?

What will happen to the height (h)of the mercury column in the manometer shown below if the stopcock is opened, given that the atmospheric pressure is 755 mmHg?

The following data describes an initial and final state for an ideal gas.Given that the amount of gas does not change in the process, what is the final temperature (°C)of the gas?

What is the pressure of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 736 mmHg and h = 9.2 cm?

What is the pressure (in atmospheres)of the sample of gas trapped in the closed-tube mercury manometer shown below if h = 23.6 cm?

What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?

How many liters of oxygen gas at 153°C and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO3? (The other decomposition product is solid potassium chloride.)

A sample of a gas occupies 1.40 × 103 mL at 25°C and 760 mmHg.What volume will it occupy at the same temperature and 380 mmHg?

A small bubble rises from the bottom of a lake, where the temperature and pressure are 4°C and 3.0 atm, to the water's surface, where the temperature is 25°C and the pressure is 0.95 atm.Calculate the final volume of the bubble if its initial volume was 2.1 mL.

Calculate the volume occupied by 35.2 g of methane gas (CH4)at 25°C and 1.0 atm.R = 0.08206 L.atm/K.mol.

The temperature of a sample of argon gas in a 365 mL container at 740.mmHg and 25°C is lowered to 12°C.Assuming the volume of the container and the amount of gas is unchanged, calculate the new pressure of the argon.

Calculate the number of moles of gas contained in a 10.0 L tank at 22°C and 105 atm.(R = 0.08206 L.atm/K*mol)

The following data describes an initial and final state for an ideal gas.Given that the amount of gas does not change in the process, what was the initial volume (L)of the gas?

A 2.50-L flask contains a mixture of methane (CH4)and propane (C3H8)at a pressure of 1.45 atm and 20°C.When this gas mixture is then burned in excess oxygen, 8.60 g of carbon dioxide is formed.(The other product is water.)What is the mole fraction of methane in the original gas mixture?

A spacecraft is filled with 0.500 atm of N2 and 0.500 atm of O2.Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side.Under these circumstances,

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What volume (L)of H₂ is formed at STP when 6.0 g of Al is treated with excess NaOH? 2NaOH + 2Al + 6H₂O $\rarr$ 2NaAl(OH)₄ + 3H₂(g)

Gases are sold in large cylinders for laboratory use.What pressure, in atmospheres, will be exerted by 2,500 g of oxygen gas (O₂)when stored at 22°C in a 40.0 L cylinder?

How many liters of oxygen gas at 153°C and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO₃? (The other decomposition product is solid potassium chloride.)

A sample of a gas occupies 1.40 × 10³ mL at 25°C and 760 mmHg.What volume will it occupy at the same temperature and 380 mmHg?

Calculate the volume occupied by 35.2 g of methane gas (CH₄)at 25°C and 1.0 atm.R = 0.08206 L.atm/K.mol.

A 2.50-L flask contains a mixture of methane (CH₄)and propane (C₃H₈)at a pressure of 1.45 atm and 20°C.When this gas mixture is then burned in excess oxygen, 8.60 g of carbon dioxide is formed.(The other product is water.)What is the mole fraction of methane in the original gas mixture?

A spacecraft is filled with 0.500 atm of N₂ and 0.500 atm of O₂.Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side.Under these circumstances,