NEET Chemistry Gibbs Free Energy MCQ Question
Calculate the Gibbs free energy change (∆G) for a reaction at 298 K if the enthalpy change (∆H) is -150 kJ/mol and the entropy change (∆S) is -400 J/mol·K.
-30 kJ/mol
-120 kJ/mol
-270 kJ/mol
30 kJ/mol
Correct Answer
Detailed Explanation
Using the formula ∆G = ∆H - T∆S, we convert ∆S from J/mol·K to kJ/mol·K: -400 J/mol·K = -0.4 kJ/mol·K. Then, ∆G = -150 kJ/mol - (298 K * -0.4 kJ/mol·K) = -150 kJ/mol + 119.2 kJ/mol = -30.8 kJ/mol, which rounds to -30 kJ/mol.
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