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Absolute Entropy and Entropy Change

AP Chemistry· difficulty 4/5

Which process has the largest positive ΔS?

  • A

    H2O(s)→H2O(l)H_2O(s) \to H_2O(l) at 0°C

  • B

    H2O(l)→H2O(g)H_2O(l) \to H_2O(g) at 100°C

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  • C

    H2O(l)→H2O(s)H_2O(l) \to H_2O(s) at 0°C

  • D

    H2O(g)→H2O(l)H_2O(g) \to H_2O(l) at 100°C

Explanation

Liquid→gas creates the largest positional disorder (gas occupies much greater volume with much lower density of states). Vaporization ΔS ≈ 109 J/(mol·K) >> melting ΔS ≈ 22 J/(mol·K).

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