Solid \( \mathrm{NH}_{4} \mathrm{I} \) on rapid heating in a closed vessel at \( 347^{\circ} \ma...

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Solid \( \mathrm{NH}_{4} \mathrm{I} \) on rapid heating in a closed vessel at \( 347^{\circ} \mathrm{C} \) develops a constant pressure of \( 275 \mathrm{~mm} H \mathrm{H} \) owing to partial decomposition of \( \mathrm{NH}_{4} \mathrm{I} \) into \( \mathrm{NH}_{3} \) and \( \mathrm{HI} \), but the pressure gradually increases further (when the excess solid residue remains in the vessel) owing to dissociation of HI. Calculate the final pressure developed at equilibrium. \( K_{p} \) for dissociation of \( \mathrm{HI} \) is \( 0.015 \) at \( 357^{\circ} \mathrm{C} \).
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