Consider the following liquid-vapour equilibrium.

$L i q u i d \to V a p o u r$

Which of the following relations is correct?

$\frac{d I n P}{d T} = - \frac{Δ H_{v}}{R T}$

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$\frac{d I n P}{d T^{2}} = - \frac{Δ H_{v}}{T^{2}}$

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$\frac{d I n P}{d T} = - \frac{Δ H_{v}}{R T^{2}}$

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$\frac{d I n G}{d T^{2}} = - \frac{Δ H_{v}}{R T^{2}}$

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Solution

The correct option is C
$\frac{d I n P}{d T} = - \frac{Δ H_{v}}{R T^{2}}$

Liquid-Vapour equilibrium can occur only at a constant pressure which is easily inferred from the equation.

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Similar questions

L i q u i d ⇌ V a p o u r

Liquid ⇌ Vapour

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L i q u i d ⇌ V a p o u r

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