Molar specific heats of an ideal gas (15-15)

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Question

Molar specific heat of an ideal gas at constant volume

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Review

Equation 15-15 says that for an ideal gas, $C_p$ is greater than $C_V$ by $R = 8.314\mathrm{J}/ (\mathrm{mol} \cdot \mathrm{K})$ , the ideal gas constant. The experimentally determined values of $C_p - C_V$ given in Table 15-1 for real gases are very close to this theoretical prediction.