The standard molar enthalpy of formation for gaseous

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The standard molar enthalpy of formation for gaseous H2O is -241.8 kJ/mol.  What is the standard molar enthalpy of formation for liquid hydrazine (N2H4)?     

N2H4(l) + O2(g) → N2(g) + 2H2O(g)      ΔH° = ?534.2 kJ

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