Question

Molar heat capacity of water in equilibrium with ice at constant pressure is :

• A. Zero
• B. Infinity $\left(\infty \right)$
• C. $40.45kJ{K}^{-1}mo{l}^{-1}$
• D. $75.48kJ{K}^{-1}mo{l}^{-1}$

Answer 1

The correct option is B Infinity $\left(\infty \right)$

By using formula,
$C_p=\frac{H_2-H_1}{\Delta T}$
$H_{2}O\left(l\right)\rightleftharpoons H_{2}O\left(s\right)$
Since the two physical states of water are in equilibrium, therefore their temperatures are also same i.e., $\Delta T=0$
We know,
$C_p=\frac{H_2-H_1}{\Delta T}=\frac{\Delta H}{0}=\infty$