AP Chemistry Gas Laws Test

According to kinetic molecular theory, in which of the following gases will the root mean square speed (which gas is moving the fastest) of the molecules be the highest at 200ºC?

• SF₆

• H₂O

• HCl

• Cl₂

• None, the molecules of all gases have the same root mean square speed at any given temperature.

A sample of a gas (5.0 mol) at 1.0 atm is expanded at constant temperature from 10.0 L to 15.0 L. The final pressure is ___ atm.

• 1.5 atm

• 15 atm

• 0.67 atm

• 3.3 atm

• 7.5 atm

A sample of He gas (2.35 mol) occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is ___L at 423 K and 1.00 atm.

• 0.709 L

• 57.9 L

• 41.1 L

• 81.6 L

• 1.41 L

Tags

NGSS.HS-PS1-5

The density of N₂O at 1.52 atm and 45.2ºC is ____ g/L. (Honors skip this question)

• 0.388 g/L

• 2.58 g/L

• 9.99 g/L

• 1.76 g/L

• 18.2 g/L

The volume of a sample of gas (2.49 g) is 752 mL at 1.98 atm and 62ºC. What is the gas?

• NO₂

• SO₃

• SO₂

• Ne

• NH₃

Use the following reaction (balance it): calcium sulfite reacts with excess hydrochloric acid (HCl) to produce water vapor, sulfur dioxide gas and calcium chloride.

What volume (in mL) of sulfur dioxide can be produced by 3.82 g of calcium sulfite when the final pressure of SO₂ is 827 torr at 44ºC?

• 1.39 x 10^-4 mL

• 0.106 mL

• 1.00 x 10^-3 mL

• 761 mL

• 578 mL

Tags

NGSS.HS-PS1-7

The pressure in a 12.2 L vessel that contains 2.34 g of carbon dioxide, 1.73 g of sulfur dioxide and 3.33 g of argon; all at 42ºC is ____ mmHg.

• 116 mmHg

• 395 mmHg

• 134 mmHg

• 263 mmHg

• 0.347 mmHg

Use the following equation (balance it): NaH + H₂O --> NaOH + H₂

A sample of NaH weighing ___ g will produce 982 mL of hydrogen gas at 28ºC and 765 torr, when the hydrogen is collected over water. The vapor pressure of water at this temperature is 28 torr.

• 0.960 g

• 925 g

• 0.0388 g

• 2.93 g

• 0.926 g

Tags

NGSS.HS-PS1-7

SO₂ (5.0 g) and CO₂ (5.0 g) are placed in a 750 mL container at 50.0ºC. The partial pressure of SO₂ in the container is ____ atm.

• 1.60 atm

• 2.76 atm

• 4.02 atm

• 0.192 atm

• 6.78 atm

Tags

NGSS.HS-PS1-7

At 333 K, which of the pairs of gases below would have the most nearly identical rates of effusion?

• CO and CO₂

• CO and N₂

• NO₂ and N₂O₄

• N₂O and NO₂

• N₂ and O₂