Gas Laws and Molar Mass Calculation

A student measures the pressure and volume of an empty water bottle to be 1.4 atm and 2.3 L. She then decreases the pressure to 0.65 atm. What is the new volume?

• 2.1 L

• 5.0 L

• 8.2 L

• 3.9 L

A scientist needs to store 28.0 moles of xenon gas at STP in the lab. What size gas tank will he need?

Remember that the molar volume of a gas at STP is 22.4 L.

• 628 L

• 473 L

• 219 L

• 376 L

A sample of gas containing 8.1 moles at STP would fill a container of what volume?

Remember that the molar volume of a gas at STP is 22.4 L.

• 342 L

• 703 L

• 475 L

• 182 L

A water bottle at STP is cooled to -155°C. What is the new pressure?

• 3.2 atm

• 0.43 atm

• 1.8 atm

• 0.27 atm

Tags

NGSS.HS-PS3-2

A student inflates a balloon with helium then places it in the freezer. The student should expect

• the balloon's volume to increase

• the balloon's volume to decrease

• the balloon's moles to increase

• the balloon's moles to decrease

Tags

NGSS.HS-PS3-4

The pressure of a 6.5 L sample of oxygen gas is measured to be 3.8 atm. If the gas is transferred into a 12 L tank at the same temperature, what is the new pressure?

• 6.6 atm

• 3.9 atm

• 4.5 atm

• 2.1 atm

A student transfers a gas at STP from a 11.0 L tank to a 25.0 L tank. If the pressure remains constant, what is the new temperature?

• 620 K

• 393 K

• 254 K

• 530 K

Tags

NGSS.HS-PS3-1

What is the pressure of a car tire that had an initial pressure of 1.8 atm but was heated from 38°C to 123°C?

• 0.9 atm

• 2.1 atm

• 1.6 atm

• 3.4 atm

A sample of gas containing 9.2 moles is transferred from an 13 L tank to a 23 L tank. What is the new number of moles that can be stored in the tank at the same temperature and pressure?

• 10.2 mol

• 13.7 mol

• 19.1 mol

• 16.3 mol

Three gases are mixed together in a container with a total pressure of 4.8 atm. If two of the gases have pressures of 1.2 atm and 1.5 atm, what is the pressure of the third gas?

• 2.5 atm

• 1.8 atm

• 2.1 atm

• 1.3 atm