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Gibbs Free Energy and Thermodynamic Favorability

AP Chemistry· difficulty 4/5

A reaction has ΔH=+20\Delta H = +20 kJ/mol and ΔS=+100\Delta S = +100 J/(mol·K). The reaction becomes spontaneous (ΔG < 0) above approximately

  • A

    20002000 K

  • B

    NeverspontaneousNever spontaneous

  • C

    2020 K

  • D

    200200 K

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Explanation

ΔG = ΔH - TΔS = 0 → T = ΔH/ΔS = 20000/100 = 200 K.

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