Consider the reaction 2NH3(g) <--> 3H2(g) N2. If K is 10^-80 which of the following is a good estimate of equilibrium concentrations of NH3, H2, and N2?
1) 1M NH3, 9M H2, and 4.5M N2
2) 5M NH3, 0M H2, and 0M N2
3) 0M NH3, 15M H2, and 5M N2
4) 5M NH3, 7.5M H2, and 2.5M N2

Do you know how to set up the equilibrium equation for the constant of equilibrium?