Q. Molar heat of vaporisation of a liquid is $6\ kJmol^{- 1}$. If the entropy change is $16\ J\ mol^{- 1}K^{- 1}$, the boiling point of the liquid is

A) 273 K
B) $375℃$
C) 375 K
D) $102℃$
Explanation

(c)
$\mathrm{\Delta}S = 16$ J $mol^{- 1}K^{- 1}$
$T_{b.p} = \frac{\mathrm{\Delta}H_{vapour}}{\mathrm{\Delta}S_{vapour}} = \frac{6 \times 1000}{16}$
$= 375K$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.