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The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by, ΔrG°= A – BT Where A and B are non-zero constants. Which of the following is true about this reaction of the following is true about this reaction of the following is true about this?

The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by, ΔrG°= A – BT Where A and B are non-zero constants. Which of the following is true about this reaction of the following is true about this reaction of the following is true about this? Correct Answer Endothermic if, A > 0

Concept:

According to Gibb’s Helmholtz equation, we get,

ΔrG° = ΔrH° – TΔrS°

Given, ΔrG° = A – BT

On comparing above two equations, we get

A = ∆H° and ∆S° = B

We know that, if ∆H° is negative, reaction is exothermic and when it is positive, reaction is endothermic.

∴ A > 0, i.e, positive, reaction is endothermic.

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