Hydrogen iodide can decompose into hydrogen and iodine gases.

2HI(g) mc026-1.jpg H2(g) + I2(g)
K for the reaction is 0.016. If 0.148 atm of HI(g) is sealed in a flask, what is the pressure of each gas when equilibrium is established?

1 answer

........2HI ==> H2 + I2
I......0.148.....0....0
C........-2x.....x....x
E.....0.148-2x...x.....x

Substitute the E line into K expression and solve for x.