9. Should your reaction be exothermic or endothermic? Explain in terms of your c

Question

9. Should your reaction be exothermic or endothermic? Explain in terms of your calculated energy and/or voltage values!

For this electrochemical cell the balanced equation is:

2Al + 3 Cu(NO3)2 -------- 2Al(NO3)3 + 3Cu

The number of electrons involved n = 6

F = 96.5Kj/V. mol e

E = 0.4 V at T = 25C

Negative value indicates that the reaction is spontaneous and exothermic

10. From your value of G0 at 250C, and an accepted value of S0 , calculate the H0 for this reaction at standard temperature conditions. Is this consistent with your answer to number 9? Explain!

Explanation / Answer

Delta G0 = Delta H0 - T Delta S0

T = 298 K

Delta G = -231.60

DeltaH = -231.60 + 298 X Delta S

so if Delta S <= 0.777 KJ then the reaction will be exothermic

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