Question:
Given that ΔH = 0 for mixing of two gases. Explain whether the diffusion of these gases into each other in a closed container is a spontaneous process or not?
Solution:
A negative ∆G means the reaction will be the spontaneous included contribution of the other factors like enthalpy(H) and entropy(S).
∆G= ∆H – T∆S
∆H being 0,
∆G will be negative (as the positive value of ∆S will give a more negative T∆S)
∆H=0 ; ∆G= -T∆S= negative.