At a certain temperature, K = 267 for the reaction N2(g) + 3H2(g) Û 2NH3(g) An equilibrium mixture of these gases contained 0.200 mol/L H2(g) and 0.800 mol/L NH3(g) . What was the concentration of N2(g)? a) 0.0150 mol/L b) 1.00 mol/L c) 0.300 mol/L d) 1.92 x 10-5 mol/L e) 4.68 x 10-5 mol/L