Question

A reaction is designated as exergonic rather than endergonic when _____.

Answer 1

Reaction is called exergonic when ΔG is negative i.e. ΔG < 0

Step-by-step explanation:

The Gibbs free energy represents the spontaneity or feasibility of a given chemical reaction at constant pressure and temperature and is given by the equation:

ΔG = ΔH - TΔS

Here, ΔG - change in the Gibbs free energy

ΔS - change in the entropy

ΔH - change in the enthalpy

T - temperature

If the value of ΔG for a chemical reaction is positive i.e. ΔG > 0, then the given chemical reaction is said to be nonspontaneous. Such a reaction is called endergonic.

Whereas, if the ΔG value for a chemical reaction is negative i.e. ΔG < 0, then the given chemical reaction is said to be spontaneous. Such a reaction is called exergonic.