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Absolute Entropy and Entropy Change

AP Chemistry· difficulty 4/5

For H2_2O(l) → H2_2O(g) at 100°C with ΔHvap_{vap} = 40.7 kJ/mol, ΔSvap_{vap} is approximately

  • A

    +109 J/(mol·K) (ΔS = ΔH/T at equilibrium)

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  • B

    +1090 J/(mol·K)

  • C

    -109 J/(mol·K)

  • D

    +40.7 J/(mol·K)

Explanation

At equilibrium (boiling point), ΔG = 0, so ΔS = ΔH/T = 40700/373 = 109 J/(mol·K).

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