PhysicsLAB Worksheet
Gas Calculations

Refer to the following information for the next two questions.

A mass of oxygen occupies 0.02 m3 at one atmosphere of pressure (1 atm = 101 kPa), and 5 ºC.
What will its volume be if the pressure is increased to 108 kPa and its temperature is changed to 30 ºC? 

How much mass of oxygen is present in this sample? 

Refer to the following information for the next two questions.

A sample of 4 grams of oxygen is at STP (101 kPa and 0 ºC).
How much volume does this sample occupy? 

How many moles of oxygen are present in this sample? 

Refer to the following information for the next two questions.

A tank of volume 590 liters (1000 liters = 1 m3) contains oxygen at 20ºC and 5 atm pressure.
Calculate the mass of oxygen present in the tank. 

How many kmoles of oxygen are in the tank? 

Refer to the following information for the next three questions.

A certain mass of hydrogen gas occupies 370 cm3 at 16 ºC and 150 kPa.
Find its volume at  -21 ºC and 420 kPa. 

How much mass of hydrogen is present? 

How many hydrogen molecules are present? 

Refer to the following information for the next question.

An air bubble of volume Vo is released near the bottom of a lake at a depth of 11.0 meters. Assume that the temperature at the bottom of the lake is 4 ºC and 12 ºC at the surface.
What will be its new volume at the surface? 

Refer to the following information for the next question.

Two flasks are connected by an tube that is initially clamped off. One flask, volume of 250 cm3, contains krypton gas at 500 mm Hg while the second flask, volume of 450 cm3, contains helium at 960 mm Hg (1 atm = 760 mm Hg). The clamp is removed so that the gases can mix.
What is the final pressure in the system? Assume constant temperature. 

Refer to the following information for the next question.

The pressure in a car tire is 28 psi at 0 ºC. As the car runs on the road, the temperature of the tire increases. Assume that the volume of the tire remains constant and that the atmospheric pressure is 14.7 psi.
What is the temperature of the tire when the tire gauge reads 35 psi? 





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