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Lesson: Isothermal

Investigate the relationship between work done on and by, the heat that enters and leaves, and the change in the internal energy of gas that is compressed or expanded at a constant temperature.

Worksheet: Isothermal • 2 Questions

Q1:

0.50 mol of an ideal gas is quasi-statically compressed at constant temperature. The volume of the gas after compression is 0.20 , where is the initial volume of the gas. Calculate the temperature of the gas if J of work was done to compress it.

Q2:

Two moles of helium gas are placed in a cylindrical container with a movable lid held in place by a piston. The gas is at a temperature of and at a pressure of Pa. The pressure supplied by the piston is decreased but the temperature of the gas does not change. The volume of the gas doubles.

Find the work done by the piston on the gas during the expansion.

How much heat enters the gas? Assume ideal gas behavior.

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