How Gibbs free energy decides spontaneity of a reaction? How
temperature can govern spontaneity of an endothermic reaction. Explain.
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Gibbs Free Energy. ... Spontaneous reactions release free energy as they proceed. Recall that the determining factors for spontaneity of a reaction are the enthalpy and entropy changes that occur for the system. The free energy change of a reaction is a mathematical combination of the enthalpy change and the entropy change ...
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Q). How Gibbs free energy decides spontaneity of a reaction?
Ans). Spontaneity tell us the direction of the reaction, but not how fast it goes. Gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. G = H - TS. And, finally the sign of delta G is ALWAYS negative for a spontaneous reaction.
Q). How temperature can govern spontaneity of an endothermic reaction. Explain.
Ans). An endothermic reaction can bespontaneous if entropy increases by more than the change in enthalpy. For endothermic reactions, ΔH> 0 and thus if the value of −TΔS overshadows the ΔH value (usually at very high temperatures) then the overall value of ΔG becomes negative and thus thereaction becomes spontaneous.
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