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Q.

Enthalpy of vaporization of a certain liquid is $24.914 k J m o l^{- 1}$ and the entropy of vaporization is $94.684 J K^{- 1} m o l^{- 1}$ . The temperature at which both the phases coexist is _____ K. (nearest integer)

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answer is 263.

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Detailed Solution

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$F o r l i q u i d \underset{}{⇌} V a p o u r$

$∴ Δ H = T Δ S$

$T = \frac{Δ H}{Δ S} = \frac{24.914 \times 10^{3}}{94.684} = 263.12 K$

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Enthalpy of vaporization of a certain liquid is 24.914 kJ mol−1 and the entropy of vaporization is 94.684 JK−1 mol−1 . The temperature at which both the phases coexist is _____ K. (nearest integer)