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If the enthalpy is positive and entropy is negative, what do you understand about Gibbs free energy?

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in Chemistry – Class 11 by (148k points)
If the enthalpy is positive and entropy is negative, what do you understand about Gibbs free energy?

(a) it is positive

(b) negative

(c) may be negative

(d) may be positive

This question was addressed to me during an online exam.

I'm obligated to ask this question of Thermodynamics topic in chapter Thermodynamics of Chemistry – Class 11

1 Answer

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The correct choice is (a) it is positive

To elaborate: According to the Helmholtz equation; G = H -TS, when enthalpy H is positive and entropy S is negative, the Gibbs free energy is always positive and the reaction is not spontaneous at all temperatures.

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