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Question

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

A
dlnGdT2=ΔHvRT2
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B
dlnPdT=ΔHvRT
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C
dlnPdT2=ΔHvT2
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D
dlnPdT=ΔHvRT2
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Solution

The correct option is D dlnPdT=ΔHvRT2
According to Clausius - Clapeyron's equation
d lnPdT=ΔHvRT2
According to this equation, the rate at which the natural logarithm of the vapor pressure of a liquid changes with temperature is determined by the molar enthalpy of vaporization of the liquid, the ideal gas constant, and the temperature of the system.

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