[xstrae]

Hi,

The reaction 2SO₂ + O₂ <---> 2SO₃ is made to place at t C in a closed vessel of 1 litre capacity and allowed to attain equilibrium.The equilibrium mixture contains 48g SO₃, 12.8g SO₂ and 9.6g of O₂. Determince Kc.

My work:

2SO₂                           + O₂                <--->       2SO₃

12.8/64 M                 9.6/32 M                           48/80 M

Kc =        (48/80)^2             =   30
        ----------------------------
       (12.8/64)^2 (9.6/32)

What am I doing wrong? My book says the correct answer is 15. thanks.

[Borek]

You sure it is Kc, not Kp?

Still, 15 doesn't look correct to me. Kc = 30 & Kp = 33.

Then I can be wrong, it happens.

[xstrae]

oh ok the book answer is probably wrong then. thanks!