Question

Ammonium carbamate decomposes as NH₂COONH₄(s) ⇋ 2NH₃(g) + CO₂(g)  In a closed vessel containing ammonium carbamate in equilibrium, NH₃ is added such that the partial pressure of NH₃ now equals original total pressure. Calculate the ratio of total pressure now to the original pressure.

Answer 1

 Let us assume that initial pressure of the mixture is P. Thus, pressure is due to NH₃ and CO₂ which are present in the ratio of 2 : 1. (from the reaction)

After adding NH₃ , partial pressure of NH₃ equals the original total pressure