How Is Total Pressure Calculated in an Evacuated Rigid Container at Equilibrium?

[magma_saber]

Homework Statement

At 258°C, Kp = 2.9 x 10^-3 atm3 for the following reaction.

NH4OCONH2(s) <--> 2 NH3(g) + CO2(g)

In an experiment carried out at 258°C, a certain amount of NH4OCONH2 is placed in an evacuated rigid container and allowed to come to equilibrium. Calculate the total pressure in the container at equilibrium.

Homework Equations

I think its [NH4OCONH2]/[NH3]^2[CO2]=2.9 x 10^-3

The Attempt at a Solution

I tried squaring it and also taking the square root of it but neither of it was right. I also tried the reciprocal.

 

[Borek]

How are pressures of ammonia and carbon dioxide related to each other?

What is the activity of solid NH4OCONH2?