Chemistry / Unit 11 Chem 2106 short lesson, about 20 seconds
Sign of ΔG Predicts Spontaneity
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The idea
At constant temperature and pressure, a process is spontaneous if ΔG is negative, nonspontaneous if ΔG is positive, and at equilibrium if ΔG is exactly zero.
In practice
A reaction with ΔG = −120 kJ proceeds spontaneously forward as written under those conditions.
Where people slip
ΔG's sign says nothing about how fast a spontaneous reaction proceeds — that question stays with Unit 9, per Chem 2063.
Your place on the trail
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