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

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The standard molar entropy of H2O (s) will be less than 70 JK-1mol-1. This is because entropy decreases when ice is formed from water as molecules reduce their movement and are arranged in an orderly fashion.

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