According to the Appendix at the back of the text:    ΔH∘fΔHf∘(kJ/mol) S∘S∘(J/mol•K) C3H8(g) –103.8 269.9 CO2(g) –393.5 213.8 H2O(l) –285.8 69.9 O2(g) 0.0 205.0     Using the standard heats of formation and the absolute entropies, calculate ΔG∘ΔG∘ (in units of kJ) for the following reaction at 300 K. C3​H8​(g)+5O2​(g)3CO2​(g)+4H2​O(l) kJ

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