Question

Which of the following equation shows the relationship between free energy change (∆G) and the change in entropy (∆S), under constant temperature and pressure?

(a) ∆G = T∆H – ∆S

(b) ∆G = T∆H/∆S

(c) ∆G = ∆H/T∆S

(d) ∆G = ∆H – T∆S

I had been asked this question during an interview for a job.

This interesting question is from Bioenergetics in chapter Biomolecules and Catalysis of Life Sciences

Answer 1

Right choice is (d) ∆G = ∆H – T∆S

Easiest explanation: The relationship between free energy change and change in entropy of a reacting system under constant temperature and pressure is given by equation ∆G = ∆H – T∆S, where ∆H is the change in enthalpy and T is temperature.