The standard enthalpy of formation of hydrogen peroxide is -187.8 kcal/mole (for the reaction H2(g) + O2(g) --> H2O2(l)). The standard enthalpy of formation of water is 285.8 kcal/mole (for the reaction H2(g) + 1/2O2(g) --> H2O(l)). Knowing this information, what is the standard enthalpy of reaction for the following reaction: H2O(l) + 1/2/O2(g) -- H2O2(l).

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A scientist measures the standard enthalpy change for the following reaction to be -14.1 kJ: 3Fe2O3(s) + H2(g)2Fe3O4(s) + H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(g) is kJ/mol.

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