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Consider the following liquid-vapour equilibrium: Liquid ⇌ Vapour. Which of the following relations is correct?

1. dlnG/dT² = ΔHv/RT²
2. dlnP/dT = ΔHv/RT
3. dlnP/dT² = −ΔHv/T²
4. dlnP/dT = −ΔHv/RT²

Correct answer: dlnP/dT = ΔHv/RT

Solution

The correct relation is derived from the Clausius-Clapeyron equation, which relates the change in vapor pressure with temperature for a phase equilibrium. It states that dlnP/dT = ΔHv/RT².

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