Hey, guys!

Can someone explain how to solve this problem?

We have a reaction 3H

_{2}+N

_{2} 2NH

_{3}Initial concentrations of N

_{2} = H

_{2} = 2 mol/L

Equilibrium concentration of NH

_{3} is 0.5 mol/L

So, I have to somehow calculate the equilibrium constant, but don't know how to do it...