General ChemistryII 3 - Chemical Thermodynamics 50. For each of the reactions in

Question

General ChemistryII 3 - Chemical Thermodynamics 50. For each of the reactions in the previous problem, answer the following questions. (You'll need the information given and calculated to answer these questions.) A. What is the heat transfer (in kJ) under reversible conditions at 25°C? B. How much pressure-volume work (in kJ) was done at 25°C? C. At 25°C, which occurs: work done on the system, work done by the system, or no work done by the system? D. What is the change in internal energy (in kJ) at 25°C? E. What is the heat transfer (in kJ) at 25°C under constant volume conditions? F. What is the heat transfer (in kJ) at 25°C under constant pressure conditions? G. At what temperature (in K) would equilibrium be reached? Assume that no change in state is occurring and that AS and AH are temperature independent. H. Find AG° (in kJ) at 45°C. Assume that no change in state is occurring and that AS and AH are temperature independent. I. Is the reaction spontaneous at 45°C? J. What is the maximum amount of useful work (in kJ) that can be obtained at 45°C?

Explanation / Answer

Answer:

I am doing it for the first one,

A) Heat transfer under the reversible condition,

=deltaH-deltaG

=-41.8-(-35.2)

=-6.6KJ

B)

work done is Pdv since volume is constant in the first case so work done is Zero

C)

No work done by the system as the change in the volume is zero if the second case we have negative hence it is work done on the system

D)

internal energy =Q+W

since w=0

so U=Q=-41.8KJ

E)

Heat transfer under constant volume that mean work is done is zero

so Q=-41.8KJ

F)

AS such there is no effect of the pressure as the change in volume is zero

so Q=-41.8KJ

we only have the privilege to answer 4 at a time

Thanks :)

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