Thermodynamics and Thermochemistry 2 Question 10
10. $\Delta H_{\text {vap }}=30 \mathrm{~kJ} / \mathrm{mol}$ and $\Delta S_{\text {vap }}=75 \mathrm{Jmol}^{-1} \mathrm{~K}^{-1}$. Find the temperature of vapour, at one atmosphere
$(2004,1 \mathrm{M})$
(a) $400 \mathrm{~K}$
(b) $350 \mathrm{~K}$
(c) $298 \mathrm{~K}$
(d) $250 \mathrm{~K}$
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Solution:
- $T=\frac{\Delta H_{\text {vap }}}{\Delta S_{\text {vap }}}=\frac{30,000}{75}=400 \mathrm{~K}$
