Q.21 (a) The enthalpy alone cannot be the deciding factor the spontaneity of the reaction.
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All spontaneous physical and chemical changes take place in the direction of a decrease in free energy. A spontaneous reaction may involve an increase or decrease in enthalpy, it may involve an increase or decrease in entropy, but it will always involve a decrease in free energy that is a negative ΔG. When ΔG is negative, the reaction would go in the direction of reactants forming products.
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