Question

The heat capacity per mole of water is ($R$ is universal gas constant)

• A. $9R$
• B. $\frac{9}{2}R$
• C. $6R$
• D. $5R$

Answer 1

Answer: (A)

$9R$

Answer 2

Molar specific heat of water = molar mass of water $\times$ specific heat of water $=\frac{18g}{mol}\times \frac{1\,cal}{{{g}^{o}}C}$ $=18\frac{cal}{mo{{l}^{o}}C}$ $=9R$ [where, $R=2\text{ }cal\text{ }mo{{l}^{-{{2}_{o}}}}\text{ }{{C}^{-1}}$ ]