The amount of heat needed to raise the temperature of one mole of an ideal gas by 1.0 K at constant volume is the same for all monatomic gases.

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Quizplus · Accepted Answer

This is because the internal energy of an ideal gas depends only on its temperature, and for a monatomic gas, the internal energy depends only on the translational motion of its atoms. Therefore, the amount of heat needed to raise the temperature of one mole of a monatomic gas by 1.0 K at constant volume (i.e. without doing any work) is proportional to its internal energy and is the same for all monatomic gases. This physical property is known as the molar heat capacity at constant volume and has a value of 3/2 R, where R is the gas constant.

The Amount of Heat Needed to Raise the Temperature of One