Problem: 5.00 mol of solid A placed in a seated 1.00-L container and allowed to decompose in gaseous B and C. The concentration of B increased until it reached 1.40 M, 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?

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5.00 mol of solid A placed in a seated 1.00-L container and allowed to decompose in gaseous B and C. The concentration of B increased until it reached 1.40 M, 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?

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