Question

The specific heat of a metal $M$ is $0.25$ cal/gK. Its equivalent weight is $12$. What is its correct Atomic weight?

• A. 25.6
• B. 36
• C. 24
• D. 12

Answer 1

Answer: (A)

25.6

According to Dulong and Pettit's law, $\text{Atomic weight}=\frac{6.4}{\text{Specific heat in cal}}$

Substitute values in the above expression.

$\text{Atomic weight}=\frac{6.4}{0.25}=25.6$

Thus, the correct atomic weight of the metal M is 25.6 g/mol.