Question

The reaction below is at dynamic equilibrium. Upper N subscript 2 (g) plus 3 upper H subscript 2 (g) double-headed arrow 2 upper N upper H subscript 3 (g). Which statement is true for the equilibrium system?

Answer 1

Answer:

• The rate of the forward reaction equals the rate of the reverse reaction.

Explanation:

The answer choices for this question are:

• The concentration of NH₃ is greater than the concentration of N₂.

• The concentration of NH₃ equals the concentration of N₂.

• The rate of the forward reaction equals the rate of the reverse reaction.

• The rate of the forward reaction is greater than the rate of the reverse reaction.

The described equation is:

       $N_2(g)+3H_2(g)\rightleftharpoons2NH_3(g)$

Solution

A dynamic equilibrium means that there is not change of the concentrations of the species but yet the forward and the reverse reactions are occurring.

The condition for a dynamic equilibrium is that both the rate of the forward and the rate of the reverse reaction are equal.

Thus, the third choice "The rate of the forward reaction equals the rate of the reverse reaction" is the correct one.

You cannot compare the concentrations of products and reactants since that depends on the initial concentrations and the equilibrium constant.

If the equilibrium constant is greater than 1 then the substances on the right are favored, if the equilibrium constatn is less than 1 then the substances of the left are favored. But you cannot tell which concentration is greater a priori.

Answer 2

Answer:

It's C, the rate of the forward reaction equals the rate of the reverse reaction.

Explanation: