A 4.20 mol4.20 mol sample of solid AA was placed in a sealed 1.00 L container and allowed to decompose into gaseous BB and C.C. The concentration of BB steadily increased until it reached 1.20 M,1.20 M, where it remained constant.
A(s)↽−−⇀B(g)+C(g)
A(s)↽−−⇀B(g)+C(g)
Then, the container volume was doubled and equilibrium was re‑established. How many moles of AA remain?

Question

A 4.20 mol4.20 mol sample of solid AA was placed in a sealed 1.00 L container and allowed to decompose into gaseous BB and C.C. The concentration of BB steadily increased until it reached 1.20 M,1.20 M, where it remained constant.
A(s)↽−−⇀B(g)+C(g)
A(s)↽−−⇀B(g)+C(g)
Then, the container volume was doubled and equilibrium was re‑established. How many moles of AA remain?

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