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Entropy of Phase Change

The standard ...

Question

The standard molar entropy of $H_{2} O$ (1) is 70 $J K^{- 1}$ $m o l^{- 1}$ . Will the standard molar entropy of $H_{2} O$ (s) be more, or less than 70 $J K^{- 1}$ $m o l^{- 1}$ ?

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Solution

The standard molar entropy of $H_{2} O$ (l) is 70 $J K^{- 1}$ $m o l^{- 1}$ . The solid form of $H_{2} O$ is ice. In ice, molecules of $H_{2} O$ are less random than in liquid water.
Thus, molar entropy of $H_{2} O$ (s)< molar entropy of $H_{2} O$ (l). The standard molar entropy of $H_{2} O$ (s) is less than $70 J K^{- 1} m o l^{- 1}$

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