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. equal to 2P
B. less than 2P
C. impossible to determine since we do not know the number of moles of gas in the container
D. greater than 2P
or
E. impossible to determine since we do not know the volume of gas in the container.

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By the ideal gas law, PV/T = constant. Use this fact to answer your question.

So the answer is then A.2P! right?

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