The reaction?H2(g) + I2(g) 2HI(g)?has Kp = 5.9 at certain temperature. A particular equilibrium mixture at that temperature contains gaseous HI at a partial pressure of 4.00 atm and hydrogen gas at a partial pressure of 0.200 atm. What is the partial pressure of I2?
0.290 atm
0.436 atm
1.79 atm
0.511 atm
13.6 atm