Question 1

A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure.What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?

Accepted Answer

A)   0.319 atm
B)   1.05 atm
C)   1.44 atm
D)   1.96 atm

Question 2

How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below?
2 H2(g) + O2(g) → 2 H2O(l)

Accepted Answer

A)   67.9 L
B)   136 L
C)   203 L
D)   407 L

Question 3

What volume (in mL) will a sample of F2 gas occupy in a syringe at 5.5 atm,if the F2 has a volume of 25.0 mL at 1.2 atm?

Accepted Answer

A)   11 mL
B)   17 mL
C)   3.8 mL
D)   5.5 mL
E)   7.6 mL

Question 4

Give the definition for diffusion.

Accepted Answer

A)   Gas molecules mix equally.
B)   Gas molecules spread out in a concentration gradient.
C)   Gas molecules escape from a container into a vacuum through a small hole.
D)   average distance between collisions
E)   Gas molecules mix unequally.

Question 5

Why does the rate of effusion increase with a decrease in the molar mass?

Accepted Answer

The rate of effusion depends o...

Question 6

A basketball is inflated to a pressure of 1.90 atm in a 24.0°C garage.What is the pressure of the basketball outside where the temperature is -1.00°C?

Accepted Answer

A)   1. 74 atm
B)   1. 80 atm
C)   2.00 atm
D)   2.08 atm

Question 7

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Accepted Answer

A)   0.2 08 L
B)   0. 416 L
C)   4.80 L
D)   9.60 L

Question 8

Give the temperature and pressure at STP.

Accepted Answer

A)   0°C and 1.00 atm
B)   0K and 1.00 atm
C)   25°C and 1.00 in Hg
D)   32K and 1 torr Hg
E)   0°C and 1 mm Hg

Question 9

The concentration of water vapor in a sample of air that has a partial pressure of water of 0.91 torr and a total pressure of air of 735 torr is ________ ppm.

Accepted Answer

A)   1.2 × 
B)   1.2
C)   0.12
D)   8.1 × 
E)   0.81

Question 10

If 2.0 mol of gas A is mixed with 1.0 mol of gas B to give a total pressure of 1.6 atm,what is the partial pressure of gas A and B?

Accepted Answer

A)   PA = 0.33 atm and PB = 0.67 atm
B)   PA = 0.67 atm and PB = 0.33 atm
C)   PA = 1.0 atm and PB = 2.0 atm
D)   PA = 2.0 atm and PB = 1.0 atm
E)   PA = 1.06 atm and PB = 0.53 atm

Question 11

In a container containing CO,H2,and O2,what is the mole fraction of CO if the H2 mole fraction is 0.22 and the O2 mole fraction is 0.58?

Accepted Answer

A)   0.20
B)   0.30
C)   0.10
D)   0.50

Question 12

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container.Which of the following statements is TRUE?

Accepted Answer

A)   Both gases have the same average kinetic energy.
B)   Both gases contribute equally to the density of the mixture under these conditions.
C)   Both gases have the same molecular speed.
D)   The mixture has a volume of 22.4 L
E)   All of the above are true.

Question 13

A syringe contains 589 mL of CO at 325 K and 1.2 atm pressure.A second syringe contains 473 mL of N2 at 298 K and 2.6 atm.What is the final pressure if the contents of these two syringes are injected into a 1.00 L container at 273 K?

Accepted Answer

A)   0.59 atm
B)   1.1 atm
C)   1.7 atm
D)   1.9 atm
E)   3.8 atm

Question 14

A large balloon is initially filled to a volume of 25.0 L at 353 K and a pressure of 2575 mm Hg.What volume of gas will the balloon contain at 1.35 atm and 253 K?

Accepted Answer

A)   22.2 L
B)   87.5 L
C)   11.4 L
D)   45.0 L
E)   58.6 L

Question 15

What is the temperature of 144.32 g of O2 found in a 5.00L container kept at a pressure of 3.28 atm assuming it behaves as a real gas?

Accepted Answer

A)   44.3 K
B)   57.5 K
C)   102 K
D)   219 K
E)   328 K

Question 16

The rate of effusion of two different gases is known as

Accepted Answer

A)   Avogadro's Law.
B)   Graham's Law.
C)   Charles's Law.
D)   Boyle's Law.
E)   Dalton's Law.

Question 17

The density of nitric oxide (NO) gas at 1.21 atm and 54.1°C is ________ g/L.

Accepted Answer

A)   0.0451
B)   0.740
C)   1.35
D)   0.273
E)   8.2

Question 18

A sample of 1.58 g of an unknown gas has a volume of 0.682 L.The sample is kept at 60°C,and exerts a pressure of 1.38 atm.What is the gas?

Accepted Answer

A)   Cl2
B)   NO
C)   NO2
D)   SO2
E)   C2H6

Question 19

Calculate the pressure of 4.55 moles of gas occupying 3.86 L at 213 K

Accepted Answer

A)   15.8 atm
B)   3.28 atm
C)   20.6 atm
D)   12.2 atm

Question 20

Determine the volume of H2S (at 375 K and 1.20 atm) needed to produce 55.0 g of S.Assume that there is excess SO2 present. 2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(g)

Accepted Answer

A)   44.0 L
B)   29.3 L
C)   22.7 L
D)   34.1 L
E)   66.0 L

Exam 11: Gases

Give the definition for diffusion.

Correct AnswerverifiedShow Answer

What is the temperature of 144.32 g of O2 found in a 5.00L container kept at a pressure of 3.28 atm assuming it behaves as a real gas?

Correct AnswerverifiedShow Answer

If 2.0 mol of gas A is mixed with 1.0 mol of gas B to give a total pressure of 1.6 atm,what is the partial pressure of gas A and B?

Correct AnswerverifiedShow Answer

How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H2(g) + O2(g) → 2 H2O(l)

Correct AnswerverifiedShow Answer

A sample of 1.58 g of an unknown gas has a volume of 0.682 L.The sample is kept at 60°C,and exerts a pressure of 1.38 atm.What is the gas?

Correct AnswerverifiedShow Answer

A basketball is inflated to a pressure of 1.90 atm in a 24.0°C garage.What is the pressure of the basketball outside where the temperature is -1.00°C?

Correct AnswerverifiedShow Answer

Calculate the pressure of 4.55 moles of gas occupying 3.86 L at 213 K

Correct AnswerverifiedShow Answer

The density of nitric oxide (NO) gas at 1.21 atm and 54.1°C is ________ g/L.

Correct AnswerverifiedShow Answer

What volume (in mL) will a sample of F2 gas occupy in a syringe at 5.5 atm,if the F2 has a volume of 25.0 mL at 1.2 atm?

Correct AnswerverifiedShow Answer

A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure.What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?

Correct AnswerverifiedShow Answer

Why does the rate of effusion increase with a decrease in the molar mass?

Correct AnswerverifiedThe rate of effusion depends o...View AnswerShow Answer

The rate of effusion of two different gases is known as

Correct AnswerverifiedShow Answer

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Correct AnswerverifiedShow Answer

Determine the volume of H2S (at 375 K and 1.20 atm) needed to produce 55.0 g of S.Assume that there is excess SO2 present. 2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(g)

Correct AnswerverifiedShow Answer

A syringe contains 589 mL of CO at 325 K and 1.2 atm pressure.A second syringe contains 473 mL of N2 at 298 K and 2.6 atm.What is the final pressure if the contents of these two syringes are injected into a 1.00 L container at 273 K?

Correct AnswerverifiedShow Answer

The concentration of water vapor in a sample of air that has a partial pressure of water of 0.91 torr and a total pressure of air of 735 torr is ________ ppm.

Correct AnswerverifiedShow Answer

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container.Which of the following statements is TRUE?

Correct AnswerverifiedShow Answer

Give the temperature and pressure at STP.

Correct AnswerverifiedShow Answer

In a container containing CO,H2,and O2,what is the mole fraction of CO if the H2 mole fraction is 0.22 and the O2 mole fraction is 0.58?

Correct AnswerverifiedShow Answer

A large balloon is initially filled to a volume of 25.0 L at 353 K and a pressure of 2575 mm Hg.What volume of gas will the balloon contain at 1.35 atm and 253 K?

Correct AnswerverifiedShow Answer

Correct Answer
verified

What is the temperature of 144.32 g of O₂ found in a 5.00L container kept at a pressure of 3.28 atm assuming it behaves as a real gas?

Correct Answer
verified

Correct Answer
verified

How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H₂(g) + O₂(g) → 2 H₂O(l)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What volume (in mL) will a sample of F₂ gas occupy in a syringe at 5.5 atm,if the F₂ has a volume of 25.0 mL at 1.2 atm?

Correct Answer
verified

A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure.What is the final pressure in the flask if an additional 2.00 g of N₂ gas is added to the flask and the flask cooled to -55°C?

Correct Answer
verified

Correct Answer
verified
The rate of effusion depends o...
View Answer

Correct Answer
verified

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H₂ gas are produced at STP?

Correct Answer
verified

Determine the volume of H₂S (at 375 K and 1.20 atm) needed to produce 55.0 g of S.Assume that there is excess SO₂ present. 2 H₂S(g) + SO₂(g) → 3 S(s) + 2 H₂O(g)

Correct Answer
verified

A syringe contains 589 mL of CO at 325 K and 1.2 atm pressure.A second syringe contains 473 mL of N₂ at 298 K and 2.6 atm.What is the final pressure if the contents of these two syringes are injected into a 1.00 L container at 273 K?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In a container containing CO,H₂,and O₂,what is the mole fraction of CO if the H₂ mole fraction is 0.22 and the O₂ mole fraction is 0.58?

Correct Answer
verified

Correct Answer
verified