A1.000 gram sample of the rocket fuel hydrazine (n2h4) is burned in a bomb calorimeter. the temperature rises from 24.62°c to 28.16°c. the heat capacity of the calorimeter (including the water) is 5860 j/°c. calculate the molar heat of combustion of hydrazine, in kj/mole.

The molar heat of combustion of hydrazine is -663.82 kJ/mole.

Explanation:

First we have to calculate the heat gained by the calorimeter.

where,

q = heat gained = ?

c = specific heat =

= final temperature =

= initial temperature =

Now put all the given values in the above formula, we get:

Now we have to calculate the enthalpy change during the reaction.

where,

= enthalpy change = ?

q = heat gained = 20.7444 kJ

n = number of moles fructose =

The molar heat of combustion of hydrazine is -663.82 kJ/mole.