Equilibirum?

Determine the equilibrium concentrations of all the gases of 0.300mol of hydrogen iodide is allowed to decompose in a 3.00L container at 225 degrees if the equilibrium constant is 8.51x10^-3

Could someone also explain to me when I'm suppose to use the hundred rule as well as the quadratic formula?

Thank you in advance!

Answer:
1. Write down the chemical equation

2 HI = H2 + I2

2. Determine the starting pressure of HI using PV = nRT. We will call that [HI]o.

3. Your equilibrium concentrations are [HI] = [HI]o - x, [H2] = [I2] = x. I've used concentration brackets for pressures. So what.

4. Your equilibrium constant expression becomes

[I2]*[H2] / ([HI])^2 = x^2 / ([HI]o - x)^2 = 8.51E-03

Solve for x.

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