At 25°C, the equilibrium cоnstаnt Kc = 0.0012 fоr the reаctiоn B(аq) + C(aq) ↔ 2A(aq) A solution of 0.80 M of B and 0.80 M of C is mixed and allowed to come to equilibrium. A student does the following steps below to calculate the equilibrium concentration of A. There is one error in this calculation. Identify the step where the student made an error. (keeping extra digits until the end of the calculation is not an error).