Chemical Thermodynamics Question 397

Question: Which of the following pairs of processes is certain to occur in a spontaneous chemical reaction-

Options:

A) Exothermic and increasing disorder

B) Exothermic and decreasing disorder

C) Endothermic and increasing disorder

D) Endothermic and decreasing disorder

Show Answer

Answer:

Correct Answer: A

Solution:

  • Measure of disorder of a system is nothing but entropy. For a spontaneous reaction, $ \Delta G<0 $ . As per Gibbs Helmholtz equation, $ \Delta G=\Delta H-T\Delta S $ Thus $ \Delta G $ is $ -ve $ only when $ \Delta H=-ve $ (exothermic) and $ \Delta S=+ve $ (increasing disorder)


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