1. The reversible, gas-phase reaction, 2A --> B is in equilibrium in a piston-cylinder

at 4.0 bar pressure. At equilibrium, the system contains 2.5 mol A and 4.25 mol

B. When 5.5 mol of an inert gas are added to the system, how many moles of B

are present at equilibrium? The pressure and temperature do not change.

Assume ideal gases.