Gas-Phase Chemical Equilibrium at Constant Pressure or Constant Volume

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This Demonstration calculates the number of moles at equilibrium for a gas-
phase reaction A ↔ rB, where A and B are ideal gases; the value of r (1/2, 1, 3/2, 
or 2) is selected with buttons. Initially the container is filled with 5 mol of 
reactant A, and equilibrium is obtained at either constant pressure (the pressure 
is set with a slider) or constant volume (the starting pressure is set with a slider). The bar graph displays the number of moles at equilibrium, including the moles 
of inert gas (the moles of inert are selected with a slider). The height of the 
piston is proportional to the final volume.