Question

(Please Print) Chemistry 112 Buffers, Entropy and Free Energy Event Please abide-by -the -Spelman-College Academic-Integrity Policy. Show-work-on questions requiring calculations. More credit is likely to be earned when explanations are legible and concise. 1. Complete the following table on reaction spontaneity withr 20 ots 20 pts. Description TAS AG AS Nonspontaneous at all T Spontaneous at higher T Nonspontaneous at lower T Spontaneous at lower T Nonspontaneous at higher T Spontaneous at allT 2. The reaction below is spontaneous at a certain temperature T 5 pts What is the sign of ASsurr? 3. As demonstrated in class, crystallization of sodium acetate from a supersaturated solution occurs spontaneously. What can be said regarding the sign of 15 pts. a. AS for the process? Justify your answer. 15 pts AH for the process? Justify your answer.

Answer 1

The spontaneity of reaction is given by the sign of deltaG which should be negative for a spontaneous process

deltaG = deltaH - TdeltaS

deltaH does not change much with the temperature but TdeltaS changes drastically with Temperature

Endothermic Reaction : deltaH is positive and also on absorbing energy deltaS is also positive . if temperature is low TdeltaS is small and deltaG wiil be positive indicating non spontaneous process. in case temperature is high TdeltaS will be more subsequently deltaG will be negative and reaction will be spontaneous.

Exothermic Reaction : deltaH is ngative and also on releasing energy deltaS is also negative hence deltaH drives the spontaneity whereas deltaS opposes it. at high temperature TdeltaS will be more which may be more than deltaH and gibbs free energy ill be positive . hence the eaction will be non spontaneous and vice versa at low temperature in exothermic reaction

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