Problem: Hydrazine (N2H4) is a fuel used by some spacecraft. It is normally oxidized by N2O4 according to the following equation: N2H4(l) + N2O4(g) → 2 N2O(g) + 2 H2O(g). Calculate ΔH˚rxn for this reaction using standard enthalpies of formation.

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FREE Expert Solution

We’re being asked to determine the standard enthalpy change (ΔH˚rxn) for the balanced reaction


N2H4(l) + N2O4(g) → 2 N2O(g) + 2 H2O(g)


Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:


H°rxn=H°f,products-H°f,reactants


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Problem Details

Hydrazine (N2H4) is a fuel used by some spacecraft. It is normally oxidized by N2O4 according to the following equation: N2H4(l) + N2O4(g) → 2 N2O(g) + 2 H2O(g). Calculate ΔH˚rxn for this reaction using standard enthalpies of formation.

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