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Given the standard free energies of formation in Appendix B in the textbook, what is the value of for the cell reaction?

CH4(g)+2O2 -----> CO2 (g) + 2H2O (l)

the delta G's in the book are as follows

CH4(g)------------> -50.8

O2(g)----- 0

CO2(g)---------> -394.4

H2O (l)---------> -237.2

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