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Entropy of Phase Change

At 373 K, ste...

Question

At 373 K, steam and water are in equilibrium and $△_{v a p} H = 40.98 k J m o l^{- 1} .$ What will be entropy change for conversion of water into steam?
$H_{2} O_{(l)} \to H_{2} O_{(g)}$

109.8 J K^{- 1} m o l^{- 1}

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31 J K^{- 1} m o l^{- 1}

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21.98 J K^{- 1} m o l^{- 1}

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326 J K^{- 1} m o l^{- 1}

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Solution

The correct option is A $109.8 J K^{- 1} m o l^{- 1}$
The change in Entropy for the vaporisation process is given as:

$△ S_{v a p} = \frac{△ H_{v a p}}{T_{b}} = \frac{40.98 \times 1000 J m o l^{- 1}}{373 K}$

$= 109.8 J K^{- 1} m o l^{- 1}$

Suggest Corrections

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Δ H

m o l^{- 1}

Δ S

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△_{v a p} H = 40.98 k J m o l^{- 1} .

H_{2} O_{(l)} \to H_{2} O_{(g)}

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H_{2} O (s) ⟶ H_{2} O (l)

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