Problem

Ammonia is produced in the Haber process:

N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)

1 mole of nitrogen and 2 moles of hydrogen are placed in a reaction vessel of

2 \text{ dm}^3

. After equilibrium is reached, the amount of nitrogen remaining is 0.4 mol. Write an expression for the equilibrium constant,

K

, and calculate its value.