Question 1

Calculate the temperature, in K, of 2.20 moles of gas occupying 3.50 L at 3.30 bar.

Accepted Answer

A)  63.1 K
B)  5.25 K
C)  337 K
D)  28.0 K

Question 2

Calculate the molecular weight of a gas that has a root mean square velocity of 269 m s-1 at 381 K.

Accepted Answer

A)  131 g mol-1
B)  83.8 g mol-1
C)  39.9 g mol-1
D)  20.2 g mol-1
E)  4.00 g mol-1

Question 3

A syringe contains 0.65 moles of He gas that occupy 750.0 mL. What volume (in L) of gas will the syringe hold if 0.35 moles of Ne is added?

Accepted Answer

A)  0.87 L
B)  4.9 L
C)  1.2 L
D)  2.1 L
E)  1.9 L

Question 4

A gas mixture contains CO, Ar, and H2. What is the total pressure of the mixture if the mole fraction of H2 is 0.35 and the pressure of H2 is 0.58 bar?

Accepted Answer

A)  1.7 bar
B)  0.20 bar
C)  0.49 bar
D)  0.60 bar
E)  2.1 bar

Question 5

Rank the following in order of decreasing rate of effusion. F2 SF6 CO Kr

Accepted Answer

A)  SF6 > Kr > F2 > CO
B)  Kr > CO > SF6 > F2
C)  F2 > Kr > CO > SF6
D)  CO > F2 > Kr > SF6
E)  CO > F2 > SF6 > Kr

Question 6

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Accepted Answer

A)  0.171 g
B)  5.76 g
C)  11.7 g
D)  131 g

Question 7

Place the following gases in order of increasing density at STP. N2 NH3 N2O4 Ar

Accepted Answer

A)  N2O4 2 3
B)  Ar 2O4 2 3
C)  N2 2O4 3
D)  NH3 2 2O4
E)  Ar 2 3 2O4

Question 8

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mmHg, the level of mercury in the tube will

Accepted Answer

A)  be 118 mm higher in the arm open to the atmosphere.
B)  be 118 mm higher in the arm connected to the gas cylinder.
C)  be 870 mm higher in the arm open to the atmosphere.
D)  be 870 mm higher in the arm connected to the gas cylinder.

Question 9

Which of the following would have a density of 1.37 g L-1 at 7.0 °C and 0.9967 bar?

Accepted Answer

A)  N2
B)  O2
C)  Kr 
D)  Rn

Question 10

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

Accepted Answer

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

Question 11

Convert 4744.1 mmHg to bar.

Accepted Answer

A)  7.549 bar
B)  5.2423 bar
C)  5.278 bar
D)  6.817 bar
E)  6.325 bar

Question 12

Give the major gas in dry air.

Accepted Answer

The answer of Give the major gas in dry air....

Question 13

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume) ?

Accepted Answer

A)  15 g F2
B)  15 g Ne
C)  15 g Kr
D)  15 g CO2
E)  All of these samples will have the same pressure.

Question 14

A sample of N2 effuses in 255 s. How long will the same size sample of Cl2 take to effuse?

Accepted Answer

A)  406 s
B)  247 s
C)  645 s
D)  155 s
E)  388 s

Exam 5: Gases

Rank the following in order of decreasing rate of effusion. F₂ SF₆ CO Kr

Correct Answer
verified

A syringe contains 0.65 moles of He gas that occupy 750.0 mL. What volume (in L) of gas will the syringe hold if 0.35 moles of Ne is added?

Correct Answer
verified

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume) ?

Correct Answer
verified

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

Correct Answer
verified

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mmHg, the level of mercury in the tube will

Correct Answer
verified

A gas mixture contains CO, Ar, and H₂. What is the total pressure of the mixture if the mole fraction of H₂ is 0.35 and the pressure of H₂ is 0.58 bar?

Correct Answer
verified

Calculate the molecular weight of a gas that has a root mean square velocity of 269 m s^-1 at 381 K.

Correct Answer
verified

Calculate the temperature, in K, of 2.20 moles of gas occupying 3.50 L at 3.30 bar.

Correct Answer
verified

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

Correct Answer
verified

Give the major gas in dry air.

Correct Answer
verified

Which of the following would have a density of 1.37 g L^-1 at 7.0 °C and 0.9967 bar?

Correct Answer
verified

Convert 4744.1 mmHg to bar.

Correct Answer
verified

A sample of N₂ effuses in 255 s. How long will the same size sample of Cl₂ take to effuse?

Correct Answer
verified

Place the following gases in order of increasing density at STP. N₂ NH₃ N₂O₄ Ar

Correct Answer
verified

Exam 5: Gases

Rank the following in order of decreasing rate of effusion. F2 SF6 CO Kr

Correct AnswerverifiedShow Answer

A syringe contains 0.65 moles of He gas that occupy 750.0 mL. What volume (in L) of gas will the syringe hold if 0.35 moles of Ne is added?

Correct AnswerverifiedShow Answer

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mmHg, the level of mercury in the tube will

Correct AnswerverifiedShow Answer

A gas mixture contains CO, Ar, and H2. What is the total pressure of the mixture if the mole fraction of H2 is 0.35 and the pressure of H2 is 0.58 bar?

Correct AnswerverifiedShow Answer

Calculate the molecular weight of a gas that has a root mean square velocity of 269 m s-1 at 381 K.

Correct AnswerverifiedShow Answer

Calculate the temperature, in K, of 2.20 moles of gas occupying 3.50 L at 3.30 bar.

Correct AnswerverifiedShow Answer

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Correct AnswerverifiedShow Answer

Give the major gas in dry air.

Correct AnswerverifiedShow Answer

Which of the following would have a density of 1.37 g L-1 at 7.0 °C and 0.9967 bar?

Correct AnswerverifiedShow Answer

Convert 4744.1 mmHg to bar.

Correct AnswerverifiedShow Answer

A sample of N2 effuses in 255 s. How long will the same size sample of Cl2 take to effuse?

Correct AnswerverifiedShow Answer

Place the following gases in order of increasing density at STP. N2 NH3 N2O4 Ar

Correct AnswerverifiedShow Answer

Rank the following in order of decreasing rate of effusion. F₂ SF₆ CO Kr

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

A gas mixture contains CO, Ar, and H₂. What is the total pressure of the mixture if the mole fraction of H₂ is 0.35 and the pressure of H₂ is 0.58 bar?

Correct Answer
verified

Calculate the molecular weight of a gas that has a root mean square velocity of 269 m s^-1 at 381 K.

Correct Answer
verified

Correct Answer
verified

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

Correct Answer
verified

Correct Answer
verified

Which of the following would have a density of 1.37 g L^-1 at 7.0 °C and 0.9967 bar?

Correct Answer
verified

Correct Answer
verified

A sample of N₂ effuses in 255 s. How long will the same size sample of Cl₂ take to effuse?

Correct Answer
verified

Place the following gases in order of increasing density at STP. N₂ NH₃ N₂O₄ Ar

Correct Answer
verified