Discussion
Heat capacity data are usually correlated as
Answer: C
Correct answer: a polynomial in temperature
Heat capacity varies with temperature, and the standard correlations express it as \( c_p = a + bT + cT^2 + dT^3 \) with tabulated coefficients for each substance. Integrating that polynomial between two temperatures gives the enthalpy change; using a single constant value is an approximation acceptable only over a narrow range.
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