JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Topic Test - Thermodynamics and Thermochemistry (8-5-21)

One gram sample of \[N{{H}_{4}}N{{O}_{3}}\] is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by 6.12 K the heat capacity of the system is 1.23 kJ/g/deg. What is the molar heat of decomposition for \[N{{H}_{4}}N{{O}_{3}}\]

A) - 7.53 kJ/mol

B) - 398.1 kJ/mol

C) - 16.1 kJ/mol

D) - 602 kJ/mol

Correct Answer: A

Solution :

[a] Molecular weight of \[N{{H}_{4}}N{{O}_{3}}=80\]

Heat evolved \[=1.23\times 6.12\]

\[\therefore \]Molar heat capacity \[=1.23\times 6.12\times C\].