According to kinetic molecular theory, in which of the following gases will the root mean square speed 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-PS3-1

The density of N₂O at 1.52 atm and 45.2ºC is ____ g/L.

• 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 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-PS1-5

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

Tags

NGSS.HS-PS3-2

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

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

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