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Calculate the standard molar enthalpy of formation ?H°f of N2H4(g) from the following information: N2(g) + 2H2(g) ? N2H4(l) ?H°rxn = +50.6 kJ N2H4(g) ? N2H4(l) ?H°rxn = -44.8 kJ A. +5.8 kJ/mol B. +95.4 kJ/mol C. +47.7 kJ/mol D. -95.4 kJ/mol E. -5.8 kJ/mol

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