When and then the temperature of vapour, at one atmosphere is ___________ K.

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Solution

Q.
When $Δ H_{vap} = 30 kJ / mol$ and $∆ S_{vap} = 75 J$ $m o l^{- 1}$ $K^{- 1}$ , then the temperature of vapour, at one atmosphere is ___________ K. [2024]

Ans.
(400)

When external pressure is 1 atm ,then vapours are formed at normal boiling point of the liquid. So in the question, normal boiling point of the liquid is asked.

$Δ S_{vap} = \frac{Δ H_{vap}}{T_{bpt}}$

$75 J$ $m o l^{- 1} K^{- 1} = \frac{30 \times 1000 J m o l^{- 1}}{T_{b p t}}$

$T_{bpt} = 400 K$

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