Choose the correct statement: A. In order for a reaction to be spontaneous, the

Question

Choose the correct statement: A. In order for a reaction to be spontaneous, the delta H forthe reaction must be negative. B. In a spontaneous reaction, the entropy of the system mustincrease. C. A reaction is spontaneous at all temperatures if delta H isnegative and delta S is positive D. At a condition of equilibrium, the Gibbs free energy changeis zero. E. Both C and D are correct A. In order for a reaction to be spontaneous, the delta H forthe reaction must be negative. B. In a spontaneous reaction, the entropy of the system mustincrease. C. A reaction is spontaneous at all temperatures if delta H isnegative and delta S is positive D. At a condition of equilibrium, the Gibbs free energy changeis zero. E. Both C and D are correct

Explanation / Answer

(A) is wrong: Spontaneity does not depends on delta H, it dependson delta G. (B) is wrong: Spontaneity depends on delta G (C) is correct: A negative delta H and positive delta S will give anegative delta G, which means exergonic and thus the reaction isspontaneous. (D) is correct: At equilibrium , there is no thermodynamic processtakes place, so delta G = 0 Thus,the answer is E. Both C and D are correct

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