A sample of methylhydrazine (rocket fuel) weighing 1.500 g was ignited in a bomb calorimeter initially at 25.0 °C, producing a temperature rise of 10.215 K. Determine the internal energy (∆U) of combustion of methylhydrazine.
To properly determine the internal energy of combustion methylhydrazine, the calorimeter was first calibrated.
A 0.5000 g sample of sucrose (MW 342.296 g/mol)) was ignited under identical conditions and produced a temperature rise of 1.98 K. For sucrose, the internal energy combustion at constant volume, ∆U, is known to be –5616.64 kJ/mol. Calculate the calorimeter constant, in kJ/K.
The calorimetry constant is 4.144 kJ/K. Using the calorimeter constant, determine ∆U, in kJ/mol, of combustion of the methylhydrazine (CH₆N₂, MW 46.10 g/mol).
