Question

An iron ball of mass $0.2kg$ is heated to ${100}^{o}C$. When it is put in ice block at $0^{0}C$, $25g$ of ice is melted. The specific heat of iron in CGS units :

• A. 1
• B. 0.1
• C. 0.8
• D. 0.08

Answer 1

Answer: (B)

0.1

Latent heat of fusion is $336J/g$.

Latent heat of vaporization is $2260J/g$.

Balancing the heat, $mc\Delta T=L\times m_{ice}$

$\Rightarrow 0.2\times 100\times C=336\times {10}^3\times 25\times {10}^{-3}$

$\Rightarrow C=420J/kg{}^{o}C=0.1cal/g{}^{o}C$