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 $
• E. $ 3R $

Answer 1

Answer: (A)

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}} $ ]