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Question

ΔHvap=30kJ/mole and ΔSvap=75 Jmol1K1. Find temperature of vapour, at one atmosphere.

A
400K
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B
350 K
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C
298 K
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D
250 K
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Solution

The correct option is D 400K
Given, ΔHvap=30kJ/mole
ΔSvap=75 Jmol1K1

Gibb's free energy equation is
ΔG=ΔHTΔS

In 1 atmosphere conditions, the system is at equilibrium. Free energy associated with vapour will be zero
ΔG=0

ΔHvap=TΔSvap

T=ΔHvapΔSvap

Tvap=400K

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