Solid on rapid heating in a closed vessel at 357°C develops a constant pressure of…

CHEMISTRY · Subjective · CBSE · Chemistry · Equilibrium · Equilibrium

Problem

Solid

NH_4I

on rapid heating in a closed vessel at 357°C develops a constant pressure of 275 mm Hg owing to partial decomposition of

\text{NH}_4\text{I}

into

\text{NH}_3

and

\text{HI}

, but the pressure gradually increases further (when the excess solid residue remains in the vessel) owing to dissociation of

\text{HI}

. Calculate the final pressure developed at equilibrium

K_P

for dissociation of

\text{HI}

is 0.015 at

357^\circ\text{C}