Calculate the concentration of B at equilibrium.

Question

At a certain temperature, the equilibrium constant for the chemical reaction shown is 4.07×10−34.07×10−3. At equilibrium, the concentration of AB is 2.1252.125 M, the concentration of BC is 2.6252.625 M, and the concentration of AC is 0.1800.180 M. Calculate the concentration of B at equilibrium.

AB(aq)+BC(aq)↽−−⇀AC(aq)+2B(aq)

[B] = ____________ M

Answer 1

AB(aq) + BC(aq)↽−−⇀ AC(aq) + 2B(aq)

Keq = [AC][B]² / [AB][BC]

4.07x10^-3 = [0.180][B]² / [2.125][2.625]

[B]² = 0.1261

[B] = 0.3551 M