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Given the following H° values,
H2(g)+ O2(g) H2O(l) H°f = -285.8 kJ/mol
H2O2(l) H2(g)+ O2(g) H°rxn = 187.6 kJ/mol
calculate H°rxn for the reaction H2O2(l) H2O(l)+ O2(g),
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