# Problem: Hydrazine (N2H4) is used as a rocket fuel because it reacts very exothermically with oxygen to form nitrogen gas and water vapor. The heat released and the increase in number of moles of gas provide thrust. Calculate the enthalpy of reaction.

###### FREE Expert Solution

We are asked to calculate the enthalpy of the give reaction.

To calculate the ΔH°rxn using bond energies, we’re going to use the following equation:

Let’s first figure out what kind of bonds and how many moles are present in each reactants and products because the given bond energies are per mole.

Let us write the balanced reaction.

Balanced Reaction:  N2H4(g) + O2(g)  N2(g) + 2 H2O(g)

*a coefficient 2 is added to H2O to balance the equation

Draw the structure of each compound.

Reactants:

N2H4:

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Hydrazine (N2H4) is used as a rocket fuel because it reacts very exothermically with oxygen to form nitrogen gas and water vapor. The heat released and the increase in number of moles of gas provide thrust. Calculate the enthalpy of reaction.