First slide

Fundamentals of thermodynamics

Question

x g sample of NH₄NO₃ is decomposed in a Bomb calorimeter. The temperature of calorimeter increase by 4°C. The heat capacity of the system is 1.25 kJ/°C. Calculate the value of x.
Given molar heat of decomposition of NH₄NO₃ at constant volume is 400 kJ mol.

Moderate

Solution

$\begin{aligned} Q_{v} = 1 .25 \times 4 = 5 \\ Q_{v} = 5 = \frac{x}{80} \times 400 \end{aligned}$
$\Rightarrow x = 1$

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