Exercise Calculating Equilibrium Pressures: 

Hydrogen iodide gas, which can be dissolved in water to form hydriodic acid, is made by passing hydrogen gas and iodine vapor over a platinum catalyst.

H2(g)  +  I2(g)         2HI(g)     KP  =  2.3 at 60 C

If enough hydrogen and iodine are added to a container at 60 C to yield initial partial pressures of 1.0 atm for both H2(g) and I2(g), what are the equilibrium partial pressures of all of the gases in the container?

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