Find H°rxn for the reaction
CH4(g)+ 2O2(g) CO2(g)+ 2H2O(l).
[ H°f (CH4(g))= -74.8 kJ/mol; H°f (CO2(g))= -393.5 kJ/mol; H°f (H2O(l))= -285.5 kJ/mol]
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