Question

The heat capacity of liquid water at constant pressure, $C_{P}$ is $18 \,cal \,deg^{-1}\, mol^{-1}$ The value of heat capacity of water at constant volume, $C_{v}$ is approximately

• A. $18 \,cal \,deg^{-1}\, mol^{-1}$
• B. $16 \,cal \,deg^{-1}\, mol^{-1}$
• C. $10.8 \,cal\, deg^{-1}\, mol^{-1}$
• D. cannot be predicted

Answer 1

Answer: (B)

$C_{p}=C_{v}=2\,cal\,deg^{-1}\,mol^{-1}$
$C_{V}=C_{P}-2 =18-2=16\,cal\,deg^{-1}\,mol^{-1}$