Based on the thermodynamic functions of enthalpy and entropy, can an unfavorable reaction that has a positive Î"G at RT be made favorable by increasing the reaction temperature? Based on the thermodynamic functions of enthalpy and entropy, can an unfavorable reaction that has a positive Î"G at RT be made favorable by increasing the reaction temperature?

A. yes, but only if Î"H is positive and Î"S is negative

B. Yes, regardless of the sign of Î"H, if Î"S is positive, a reaction can be rendered favorable by increasing the temperature.

C. only if both Î"H and Î"S are negative

D. No, an unfavorable reaction cannot be rendered favorable.

Question

Chemistry

Marley Zuniga

5 September, 08:41

Based on the thermodynamic functions of enthalpy and entropy, can an unfavorable reaction that has a positive Î"G at RT be made favorable by increasing the reaction temperature? Based on the thermodynamic functions of enthalpy and entropy, can an unfavorable reaction that has a positive Î"G at RT be made favorable by increasing the reaction temperature?

A. yes, but only if Î"H is positive and Î"S is negative

B. Yes, regardless of the sign of Î"H, if Î"S is positive, a reaction can be rendered favorable by increasing the temperature.

C. only if both Î"H and Î"S are negative

D. No, an unfavorable reaction cannot be rendered favorable.

+2

Answers (1)

Know the Answer?

Amiya Barron · Answer 1

B. Yes, regardless of the sign of Î"H, if Î"S is positive, a reaction can be rendered favorable by increasing the temperature

Explanation:

Given

∆G = ∆H - T∆S

If ∆G is to remain negative, then irrespective of the sign of ∆H, ∆S must be positive. If ∆S is positive, then increase in T will only lead a more negative value of ∆G. The positive ∆S maintains T∆S at a positive value that can be subtracted from the value of ∆H which is constant.