Question

Quantity of heat lost in condensation of $10gm$ of steam at ${100}^{\circ }C$ is

• A. $2.26\times {10}^{5}J$
• B. $2.26\times {10}^{4}J$
• C. $22.6J$
• D. $44.52\times {10}^{4}J$

Answer 1

The correct option is B $2.26\times {10}^{4}J$

We know,

$L_v$ of water$=2.26\times {10}^{6}J/kg$

Heat lost will be in form of Latent heat,

$H=m{L}_v=0.01\times 2.26\times {10}^6=2.26\times {10}^{4}J$

Option $\text{B}$ is the correct answer