Discussion
Heat capacity at constant pressure is defined as the
Answer: A
Correct answer: rate of change of enthalpy with temperature
\[ C_p = \left(\frac{\partial H}{\partial T}\right)_P. \] Its counterpart \( C_v \) is the rate of change of internal energy at constant volume, and the two differ by \( R \) for an ideal gas. Because most process work is done at constant pressure, \( C_p \) is the one tabulated and the one that appears in enthalpy balances.
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