What is the total pressure in the container after equilibrium has been established?

Question

A large amount of solid ammonium carbamate is placed in a rigid container at 25.05 °C and allowed to come to equilibrium. What is the total pressure in the container after equilibrium has been established?

Ammonium carbamate, NH₄OCONH₂, decomposes to produce ammonia and carbon dioxide. At 25.05 °C the value K_p for this reaction is 0.00432 .

NH4​OCONH2​(s)2NH3​(g)+CO2​(g)

Answer 1

NH_4​OCONH₂​(s) <==> 2NH₃​(g) + CO₂​(g)

xs....................................0..............0..............Initial

......................................+2x...........+x............Change

........................................2x.............x............Equilibrium

Kp = [NH₃]²[CO₂]

0.00432 = (2x)²(x) = 4x³

x³ = 0.00108

x = 0.103 atm

Total pressure = 2x + x = (2 * 0.103) + 0.103

Total pressure = 0.309 atm