Equilibrium Equation with Missing Concentration

Question

The equilibrium constant K_c for the reaction of nitrogen and hydrogen to produce ammonia at a certain temperature is 6.00 ×× 10⁻². Calculate the equilibrium concentration of ammonia if the equilibrium concentrations of nitrogen and hydrogen are 4.26 M and 2.09 M, respectively.

Answer 1

N₂ + 3H₂ ==> 2NH₃ ... balanced equation

Kc = 6.00x10^-2 = [NH₃]² / [N₂][H₂]³

Substituting the known values @ equilibrium, and solving for [NH3] ...

6.00x10^-2 = [NH₃]² / [4.26][2.09]³

6.00x10^-2 = [NH₃]² / 38.89

[NH₃]² = 2.333

[NH₃] = 1.53 M