Coupled Reactions

AP Chemistry· difficulty 4/5

A→B ΔG=+10 C→D ΔG=-25 coupled: A+C → B+D ΔG_total = ?

What is ΔG for the coupled reaction?

  • A

    0 kJ

  • B

    -15 kJ

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  • C

    +35 kJ

  • D

    +15 kJ

Explanation

ΔG_total = (+10) + (-25) = -15 kJ; the net reaction is spontaneous when coupled.

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