Question

# Calculate the change in Gibbs free energy for each of the following sets of ?H?rxn, ?S?rxn,...

Calculate the change in Gibbs free energy for each of the following sets of ?H?rxn, ?S?rxn, and T.

Part A ?H?rxn=? 115 kJ ; ?S?rxn= 248 J/K ; T= 295 K

Part B ?H?rxn= 115 kJ ; ?S?rxn=? 248 J/K ; T= 295 K

Part C ?H?rxn=? 115 kJ ; ?S?rxn=? 248 J/K ; T= 295 K Express your answer using two significant figures.

Part D ?H?rxn=? 115 kJ ; ?S?rxn=? 248 J/K ; T= 565 K Express your answer using two significant figures.

Part E Predict whether or not the reaction in part A will be spontaneous at the temperature indicated.

Part F Predict whether or not the reaction in part B will be spontaneous at the temperature indicated.

Part G Predict whether or not the reaction in part C will be spontaneous at the temperature indicated.

Part H Predict whether or not the reaction in part D will be spontaneous at the temperature indicated.

1. A.

= -115*10^3 - 295*248

= -188160 joules Or -188.160 KJ

E. is negative so the reaction is spontaneous.

B. 115*10^3 -295*(-248)

= 188160 Joules or 188.160 KJ

F. As is positive in reaction B so it is not a spontaneous reaction.

C. -115*10^3 - 295*(-248)

= -41840 Joules or -41.840 KJ

G. As is negative so reaction C is not spontaneous.

D. -115*10^3 - 565*(-248)

= -25120 Joules or -25.120 KJ

H. is negative in D so the reaction is spontaneous.

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