Gibbs free energy: is it feasible?

Change ΔH, ΔS and temperature to see ΔG and whether the reaction is feasible.

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Questions students ask

Does a negative ΔG mean the reaction happens quickly?

No. It means it is feasible; the rate depends on the activation energy. Diamond turning into graphite is feasible but immeasurably slow.

What formula does it use?

ΔG = ΔH − TΔS (ΔS in kJ/K mol, T in kelvin).

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