Gas Law Practice Before Test

A balloon is filled with 0.75 moles of helium at 290 K. If the balloon expands to 2.3 L, what pressure (in kPa) is exerted by the helium?

• 786 kPa

• 7.76 kPa

• 0.00127 kPa

• 293 kPa

At 1.01 atm (ground level), a balloon has a volume of 1.8 L. If it goes high enough that the pressure is 0.76 atm, what will the new volume be?

• 2.4 L

• 0.42 L

• 1.4 L

• 3.6 L

An airtight, rigid container of PH₃ was collected at 285 K and 760 mmHg. If the temperature drops to 268 K during a winter storm, what will the new pressure in the container be?

• 715 mmHg

• 0.00140 mmHg

• 808 mmHg

• 1310 mmHg

Which of these are postulates of the kinetic molecular theory?

• Gas particles move in constant, random motion.

• Gas particles turn into liquid particles when they move slowly.

• Gas particles have elastic collisions.

• Gas particles have negligible volume.

As pressure increases, volume decreases. Describe the relationship:

• Direct Relationship

• Inverse Relationship

• No Relationship

As temperature increases, volume increases. Describe the relationship:

• Direct Relationship

• Inverse Relationship

• No Relationship

If 22.00 g of CO2 has a volume of 50.00 L and a pressure of 0.8210 atm. What must be the temperature of the gas. Molar mass of CO2 is 44 g/mol

• 1000

• 100

• 10

• 1

What is the variable for this number 22.4 L

• P
• T
• n
• V

What is the variable for this number 9.10 atm

• P
• T
• n
• V

What is the variable for this number 122 K

• P
• T
• n
• V