Question

Calculate the total amount of heat energy required to convert $100g$ of ice at $-{10}^{o}C$ completely into water at ${100}^{o}C$. Specific heat capacity of ice $=2.1J{g}^{-1}{K}^{-1}$, specific heat capacity of water $=4.2J{g}^{-1}{K}^{-1}$, specific latent heat of ice $=336J{g}^{-1}$

• A. $1.11\times {10}^{4}J$
• B. $0.77\times {10}^{4}J$
• C. $7.77\times {10}^{5}J$
• D. $7.77\times {10}^{4}J$

Answer 1

The correct option is D $7.77\times {10}^{4}J$

Energy required to increase the ice to $0^{o}C$ ,then converting into water and then to raise its temperature to ${100}^{o}C$

Energy required$=100\times 2.1\times 10+100\times 336+100\times 4.2\times 100$

energy required is $7.77\times {10}^{4}J$