Question 4 Initially, a closed vessel at 150 °C has a partial pressure of IBr of 0.350 atm and partial pressures of 12 and Br2 each of 0.750 atm. What is the partial pressure of IBr once the system reaches equilibrium? 2 IBr(g) 12(g) + Br₂(g) K = 8.5 x 10-3

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