A flask of 1 litre having at 2.0 atm and 200 K is connected with another flask of…

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

A flask of 1 litre having

\text{NH}_3(\text{g})

at 2.0 atm and 200 K is connected with another flask of volume 800 mL having

\text{HCl}(\text{g})

at 8 atm and 200 K through a narrow tube of negligible volume. The two gases react to form

\text{NH}_4\text{Cl}(\text{s})

with evolution of 43

\text{kJ mol}^{-1}

heat. If heat capacity of

\text{HCl}(\text{g})

at constant volume is

20 \text{ JK}^{-1} \text{ mol}^{-1}

and neglecting heat capacity of flask,

\text{NH}_4\text{Cl}

and volume of solid

\text{NH}_4\text{Cl}

formed, calculate the heat produced, final temperature and final pressure in flasks. (Assume

R = 0.08 \text{ litre-atm K}^{-1} \text{ mol}^{-1}