Given the equation representing a reaction at equilibrium:
n2(g) + 3h2(g) < ==> 2nh3(g)
what occurs when the concentration of h2(g) is increased?
(1) the equilibrium shifts to the left, and the concentration of n2(g) decreases.
(2) the equilibrium shifts to the left, and the concentration of n2(g) increases.
(3) the equilibrium shifts to the right, and the concentration of n2(g) decreases.
(4) the equilibrium shifts to the right, and the concentration of n2(g) increases.