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Question:

A reaction occurs spontaneously if

TΔS<ΔH and both ΔH and ΔS are +ve

TΔS>ΔH and both ΔH and ΔS are +ve

TΔS=ΔH and both ΔH and ΔS are +ve

TΔS>ΔH and both ΔH and ΔS are -ve

Solution:

The spontaneity of reaction is based upon the negative value of ΔG. ΔG is based upon T, ΔS and ΔH according to following equation (Gibbs-Helmholtz equation) ΔG = ΔH - TΔS