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Chemistry: Unit 2 – Worksheet 3a
PVT Problems
STP Standard Temperature 0˚C & 1.0 atm
Use PVT tables to solve the following gas law problems. The problem-solving steps are provided for the first through,
but you will need to work through the steps on your own for the second batch. You DO NOT need to calculate anything
at this point-we will do that part tomorrow!

1. A sample of gas occupies 150 mL at 25 ˚C. What is its volume when the temperature is increased to 50˚C?
(P constant)
a. Which variable stays constant? Cross it out on the PVT table.
b. Sketch a graph of the trend in the problem.
c. Convert temperatures to Kelvin (if temperature is changing in the problem).
d. Fill in the “effect” arrows on the PVT table
e. Fill in the numbers on the PVT table.

P       T          V
Initial
Final
Effect
2. The pressure in a bicycle tire is 105 psi at 25˚C here in Phoenix. You take the bicycle up to Flagstaff, where
the temperature is – 5˚C. What is the pressure in the tire?
a. Which variable stays constant? Cross it out on the PVT table.
b. Sketch a graph of the trend in the problem.
c. Convert temperatures to Kelvin (if temperature is changing in the problem).
d. Fill in the “effect” arrows on the PVT table
e. Fill in the numbers on the PVT table.

P       T          V
Initial
Final
Effect
3. What would be the new pressure if 250 cm3 of gas at standard pressure is compressed to a volume of 150
cm3 ?
a. Which variable stays constant? Cross it out on the PVT table.
b. Sketch a graph of the trend in the problem.

P         T          V
Initial
Final

Kovach Chemistry                                     1                                            U2WS3a
Effect                                            c.      Convert temperatures to Kelvin (if temperature is
changing in the problem).
d. Fill in the “effect” arrows on the PVT table
e. Fill in the numbers on the PVT table.

4. What would be the new volume if 250 cm3 of gas at 25˚C and 760 mmHg pressure were changed to
standard conditions of temperature? (Hint…what is 760 mmHg equal to in atmospheres? Is pressure
changing?)

P         T         V
Initial
Final
Effect

5. At what temperature would a 350 mL sample of gas at 0˚C and 730 mm pressure fit into a 250 mL flask at
standard pressure?

P         T         V
Initial
Final
Effect

6. A 475 cm3 sample of gas at standard temperature and pressure is allowed to expand until it occupies a
volume of 600. cm3. At what temperature would the gas return to standard pressure?
P        T         V
Initial
Final
Effect

8. The diagram below left shows a box containing gas molecules at 25˚C and 1 atm pressure. The piston is
free to move.

Kovach Chemistry                                    2                                         U2WS3a
In the box at right, sketch the arrangement of molecules and the position of the piston at standard
temperature and pressure. Does the volume decrease significantly? Why or why not?

Kovach Chemistry                                  3                                          U2WS3a

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