Consider the following liquid - vapour equilibrium Liquid ⇌ Vapour. Which of the following relations is correct?
dlnGdT2=ΔHvRT2
dlnPdT2=−ΔHvT2
dlnPdT=−ΔHvRT
dlnPdT=ΔHvRT2
A
dlnPdT2=−ΔHvT2
B
dlnPdT=−ΔHvRT
C
dlnPdT=ΔHvRT2
D
dlnGdT2=ΔHvRT2
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Solution
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According to Clausius - Clapeyron's equation
dlnPdT=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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