Predicting and Calculating G°In Section we used Hess's law

Chapter , Problem 1PE

(choose chapter or problem)

Problem 1PE

Predicting and Calculating G°

In Section we used Hess's law to calculate Atf° for the combustion of propane gas at 298 K.

C3H8(g) + 5 O2(g)3 CO2(g) + 4 H2O(l)  = 12220 kJ

(a) Without using data from Appendix C. predict whether G° for this reaction is more negative or less negative than . (b) Use data from Appendix C to calculate G°

 for the reaction at 298 K. Is your prediction from part (a) correct? If a reaction is exothermic and its entropy change is positive, which statement is true?

(a) The reaction is spontaneous at all temperatures, (b) The reaction is nonspontaneous at all temperatures, (c) The reaction is spontaneous only at higher temperatures, (d) The reaction is spontaneous only at lower temperatures.