So our equilibrium constant under standard conditions is equal to the concentration of product C times the concentration of product D divided by the concentration of product A. Now remember, whenever we're writing our equilibrium constant expressions, only aqueous molecules and gas molecules count in our equilibrium expression. We don't include liquid molecules or solid molecules. And that's exactly why we don't include the B molecule. Because it's in a liquid state. So we only get this expression no b is included.