ThermochemistryHard

Question

One gram sample of NH4NO3 is decomposed in a bomb calorimer, the temperature of the calorimeter increase by 6.12 K. The heat capacity of the system is 1.23 kJ/g/deg. What is the molar heat of decomposition for NH4NO3 ?

Options

A.-7.53 kJ/mol
B.-398.1kJ/mol
C.-16.1kJ/mol
D.-602kJ/mol

Solution

Heat produced (Q) = mC ᐃT
= 1 × 1.23 6.12kJ
Molecule weight of NH4NHO3 = 80gm
Heat produced per mole = 80 × 1.23 × 6.12 = 602kJ/mole

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