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Question

Following relationship defines the Gibb’s free energy G

A.

G = H + TS 

B.

G = H - TS


C.

G = U + TS 

D.

F = U - TS 


Answer ( Option B)

G = H - TS


Solution

The relationship defines the Gibb’s free energy is,                                                   G = H - TS 

Where,

G =  Gibb’s free energy (JorkJ), =   Enthalpy (kJorJ), T = Temperature (K), S Entropy (J/mol-K).

Hence, the correct option is (B).

&Key Points:-

(1)    A negative means that the reactants or initial state have more free energy than the products or final state. 

(2)  Undergone reactions: Reaction is non-spontaneous, energy is absorbed, 

(3)    Exergonic reaction: Reaction is spontaneous, energy is released, 


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