Question

The molar heat capacity of water in equilibrium with ice at constant pressure is

• A. Zero
• B. Infinity
• C. 40.45 kJ^-1 K^-1
• D. 75.48 J K^-1 mol^-1

Answer 1

The correct option is B

Infinity

We know that heat capacity at constant pressure is given by $C_p=(\frac{△H}{△T}{)}_p$

Since the phase transformation i.e., ice \rightleftharpoons water, takes place at a fixed temperature so

$△T=0$

$C_p=\frac{△H}{0}=\infty$