Question

$80g$ of water at ${30}^{o}C$ is poured on large block of ice at $0^{\circ }$C. The mass of ice that melts is

Given, Latent heat = $334J/g$

Specific heat of water $=4.2J{g}^{-1}{C}^{o-1}$

• A. $1600g$
• B. $30g$
• C. $150g$
• D. $80g$

Answer 1

The correct option is B $30g$

$\Delta T={30}^{o}C$

Heat released by water is abosrbed by ice ,the final temperature of water will be $0^{o}C$

$\Rightarrow 8\times 1\times 30=m\times 80$

$\Rightarrow m=30g$