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Q. $\Delta H_{\text {vap }}=30 \,kJ / mol$ and $\Delta S_{\text {vap }}=75 J\,mol ^{-1} \,K ^{-1}$. Find the temperature of vapour, at one atmosphere

IIT JEEIIT JEE 2004Thermodynamics

Solution:

$T=\frac{\Delta H_{\text {vap }}}{\Delta S_{\text {vap }}}=\frac{30,000}{75}=400\, K$