In an analysis of the following reaction at 100°C, Br2(g) + Cl2(g) ⇌ 2BrCl(g) the equilibrium concentrations of the reactants were found to be [Br2] = 3.6 × 10−3 M and [Cl2] = 5.1 × 10−3 M. The equilibrium constant is Kc = 7.1. Determine the value of [BrCl].