Gibbs Free Energy and Thermodynamic Favorability

AP Chemistry· difficulty 3/5

ΔH > 0 and ΔS > 0 for the reaction.

What does the marked crossover temperature on the ΔG vs T plot represent?

A
$The boiling point of the reactants$
B
$The temperature at which ΔG = 0; reaction becomes spontaneous above it$
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C
$The temperature where ΔH = 0$
D
$The point of maximum entropy$

Explanation

ΔG = ΔH - TΔS = 0 when T = ΔH/ΔS; above this T, with ΔH>0 and ΔS>0, ΔG becomes negative and the reaction is spontaneous.

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