The equilibrium constant, Kp, for the following reaction is 280. at 150.°C. Suppose that a quantity of IBr is placed in a closed reaction vessel and the system is allowed to come to equilibrium at 150.°C. When equilibrium is established, the pressure of IBr is 0.200 atm. What is the pressure of I2 at equilibrium?
I2(g) + Br2(g) 2IBr(g) + 11.7 kJ
a. 0.168 atm
b. 0.096 atm
c. 0.067 atm
d. 0.012 atm
e. 0.00014 atm
Answer: d. 0.012 atm