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# Equilibrium Has Been Reached

APCHEM-Y8WGXL

Consider the following reaction in a closed, rigid container:

$$N_2(g) + 3H_2(g) ⇄ 2NH_3(g) \quad \Delta H = 85 \ \text{kJ}$$

Which of the following observations confirms that equilibrium has been reached?

A

The total pressure of the system is decreasing at a constant rate.

B

The density of the gas mixture remains constant.

C

The total mass has decreased to a constant value.

D

The partial pressure of nitrogen gas remains constant.