Question

In: Chemistry

The criterion for a spontaneous chemical reaction is: a) ΔrG < 0 b) ΔrS = 0...

The criterion for a spontaneous chemical reaction is:

		a) Δ_rG < 0
		b) Δ_rS = 0
		c) Δ_rH > 0
		d) Δ_rG = 0

Expert Solution

The criterion for sponataneous chemical reaction depend upon G but not H, and S.

Enthalpy: H = -ve, spontaneous

H = +ve, non-spontaneous

H = 0, equillibrium

but it is not criterion for spontaneous process in all cases

Entropy: S = +ve, Spontaneous

S = -ve, non-spontaneous

S = 0, Equilibrium

but it is not criterion for spontaneous process in all cases

So, Gibbs freeenergy is introduced to explain spontaneity

G = H - TS

Gibbs freeenergy:

G = -ve, spontaneous

G = +ve, non-spontaneous

G = 0, Equilibrium

So, by using Gibbs freeenergy is used to explain spontaneity of reaction by combining both enthalpy and entropy in all cases at all temperatures and pressures

queen_honey_blossom answered 2 years ago

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