Consider the following reaction: A + B + C 3 D

The reaction mixture is initially at equilibrium with [A] = [B] = [C] = 0.223 M and [D] = 0.555 M

At that point, all of D is removed from the reaction mixture, and then the reaction is allowed to return to equilibrium.

Determine the concentration of A, in M, after the new equilibrium is established.