I2(g) + Br2(g) is at equilibrium with 2IBr(g), Kc=8.7x10^2 at 150 degrees celcius. Suppose that 0.84 mol of I2 and 0.84 mol of Br2 are placed in a 3.000 liter flask and allowed to reach equilibrium at 150 degrees celcius. What are the equilibrium concentrations of IBr, I2 and Br2?