[darkknight]

Here is the question I have been struggling with:

Ammonia gas decomposes to nitrogen and hydrogen spontaneously with an
equilibrium constant, Kp = 5.9 x 10^9. Calculate the partial pressure
of ammonia at equilibrium given that the partial pressure of nitrogen
and hydrogen are both 2.7 atm initially. 

I created an ICE table to organize my data. I'm having difficulty with the ammonia gas. I'm not sure if it's supposed to be 0 atm initially.   

[Borek]

If Kp is that high, where does the equilibrium lie?