Which type of equilibrium exists in a sealed flask containing Br2 (ℓ) and Br2 (g) at 298 K and 1.0 atm? (1) static phase equilibrium

(2) static solution equilibrium

(3) dynamic phase equilibrium

(4) dynamic solution equilibrium

The correct answer is 3.

A dynamic phase equilibrium is when a reversible reaction no longer changes its ratio of reactants to products. However, substances continue to move between the chemicals at an equal rate, which means the net change is 0. This is known as a steady state.