Discussion
Consider the following statements about heat capacities.
1. The value at constant pressure exceeds that at constant volume for a gas.
2. For liquids and solids the two are nearly equal.
3. The difference is negligible for gases as well.
Answer: D
The first two are correct. The third is wrong, since for an ideal gas the difference is the gas constant, which is far from negligible against typical molar heat capacities. For a diatomic gas it is about a quarter of the value.
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