Consider the reaction below. At equilibrium, the concentration of B is 0.057 M and the concentration of C is 0.0716 M . If the equilibrium constant is K c = 0.0038 , what is the equilibrium concentration of A ? 2 A ( g ) ↔ B ( g ) 3 C ( g ) Select the correct answer below: 5.506 × 10 − 3 M 0.059 M 0.074 M 1.074 M