A 4.60 mol sample of solid A was placed in a sealed 1.00 L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) ⇌ B(g) + C(g) Then, the container volume was doubled and equilibrium was re-established. How many moles of A remain? moles of A : mol