Problem: Find the temperature above which a reaction with a ΔH of 123.0 kJ/mol and as ΔS of 90.00 J/K•mol becomes spontaneous.

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We’re being asked to determine temperature above which a reaction with a ΔH of 123.0 kJ/mol and as ΔS of 90.00 J/K•mol becomes spontaneous.


The standard free energy change of a reaction (ΔG) is given by the following equation:

G=H-TS


Recall that if:

• ΔG < 0 or ΔG = (–); the reaction is spontaneous
• ΔG = 0; the reaction is at equilibrium
• ΔG > 0 or ΔG = (+); the reaction is non-spontaneous

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Problem Details

Find the temperature above which a reaction with a ΔH of 123.0 kJ/mol and as ΔS of 90.00 J/K•mol becomes spontaneous.