Concept:Heat capacity (C) of a body or system is defined as the quantity of heat energy required to change its temperature by exactly 1 Kelvin (or 1 degree Celsius).
Formula:$$ C = \frac{q}{\Delta T} $$
Solution:- The numerator, heat (q), is measured in Joules (J) or kiloJoules (kJ).
- The denominator, change in temperature (\( \Delta T \)), is measured in Kelvin (K).
- Therefore, the unit becomes \( \text{J/K} \) or, scaled up, \( \text{kJ/K} \).
- Note: The past paper key accepts \( \text{kJ/K} \) (Option C in original print) as the specific answer here, though \( \text{JK}^{-1} \) is also physically valid. We faithfully preserve the source's verified correct answer.
Why other options are incorrect:\( \text{kJmol}^{-1} \) is the unit for molar enthalpy, not heat capacity (it lacks a temperature dimension). \( \text{kJmol} \) is dimensional nonsense.
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