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Gibbs Free Energy and Thermodynamic Favorability

AP Chemistry· difficulty 3/5

ΔH<0, ΔS>0 always spont. ΔH>0, ΔS>0 spont. high T ΔH<0, ΔS<0 spont. low T ΔH>0, ΔS<0 never spont.

A reaction has ΔH > 0 and ΔS < 0. Under what conditions is it spontaneous?

  • A

    Spontaneous only at low T

  • B

    Never spontaneous at any temperature

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  • C

    Spontaneous only at high T

  • D

    Always spontaneous

Explanation

ΔG = ΔH - TΔS will always be positive when ΔH>0 and ΔS<0, so the reaction is never spontaneous.

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