Question

One gram sample of $N{H}_{4}N{O}_3$ is decomposed in a bomb calorimeter, the temperature of the calorimeter increases by $6.12K$. The heat capacity of the system is $1.23kJ/g/deg$. What is the molar heat of decomposition for $N{H}_{4}N{O}_3$?

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

Answer 1

The correct option is D $+602kJ/mol$

Heat produced $\left(Q\right)=mC\Delta T$
$=1\times 1.23\times 6.12kJ$

Molecule weight of $N{H}_{4}N{O}_3=80gm$

Heat produced per mole $=80\times 1.23\times 6.12$
$=602kJ/mole$

Hence, option D is correct..