Ideal gas law: A fixed amount of ideal gas is held in a rigid container that expands negligibly when heated. At 20°C the gas pressure is p. If we add enough heat to increase the temperature from 20°C to 40°C, the pressure will be
A) impossible to determine since we do not know the number of moles of gas in the container.
B) greater than 2p.
C) less than 2p.
D) equal to 2p.
E) impossible to determine since we do not know the volume of gas in the container.

Question

Quizplus · Accepted Answer

The pressure of an ideal gas is directly proportional to its temperature (in Kelvin) when the volume and the amount of gas are constant. Increasing the temperature from 20°C (293K) to 40°C (313K) does not double the temperature, so the pressure will increase but will not double, making it less than 2p.

Ideal Gas Law: a Fixed Amount of Ideal Gas Is