Posted by Veronica on Sunday, June 8, 2014 at 11:22am.
I posted this last night, A 0.500L vessel initially contains 0.0125 mol of H2S2 . Find the equilibrium concentrations of H2 and S2. Kc = 1.67 x 10^7
2 H2S <> 2 H2 + S2
I have come up with this equation so far, but I am lost now because I don’t even know if this is right.
1.67x10^7 = ((4x^2)(x)) / (0.0006254x^2)

Chemistry  DrBob222, Sunday, June 8, 2014 at 2:25pm
It's close but not right.
1.67E7 = (2x)^2(x)/(0.0252x)^2 is what you started with and that's correct. Your error was in expanding the denominator.
1.67E7 = 4x^3/(6.25E4 0.1x +4x^2)
The next step is to multiply 1.67E7 x the denominator, then collect the terms in descending order and you end up with a cubic equation. I haven't checked this but I ended up with (and you should go through the math to make sure it's right)
4x^3 6.68E7x^2 +1.67E8x 1/04E10 = 0
and solve that for x.

oopsChemistry  DrBob222, Sunday, June 8, 2014 at 2:36pm
I made a typo in that cubic equation.
4x^36.68E7x^2+1.67E8x1.04E10 = 0
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