Question

Consider the following liquid – vapour equilibrium.
$Liquid\rightleftharpoons Vapour$
Which of the following relations is correct?

• A. $\frac{dInP}{d{T}^2}=\frac{-\Delta H_v}{T^2}$
• B. $\frac{dInP}{dT}=\frac{\Delta H_v}{R{T}^2}$
• C. $\frac{dInG}{d{T}^2}=\frac{\Delta H_v}{R{T}^2}$
• D. $\frac{dInP}{dT}=\frac{-\Delta H_v}{RT}$

Answer 1

The correct option is B $\frac{dInP}{dT}=\frac{\Delta H_v}{R{T}^2}$

This is Clausius – Clapeyron equation.