[bobpeterson819]

I have trouble with two problems, I have tried on my own, but what I've gotten seems wrong. The questions are shown below:

1. The equilibrium constant, K, for the fowlling reaction is 10.5 at 350K.

2 CH2Cl2(g) -----> CH4(g) + CCl4(g)

At equilibrium mixture of the three gases in a 1.00L flask at 350K contains 5.17E-2 M CH2Cl2, 0.291M

CH4 and 0.168 M CCl4. What will be the concentration of the three gases once equilibrium has been

reestablished, if 0.123 mol of CCl4(g) is added to the flask?

I found the x value equal to 0.205 by setting up the ICE table, but my new concentrations don't make

sense when I plug the x value back to the equilibrium equation. I don't know what I did wrong on this

problem.

Another one is :

The equilibrium constant, Kc, for the following reaction is 1.37E-3 at 233K.

2 NOBr(g) -----> 2NO(g) + Br2(g)

When a sufficiently large sample of NOBr(g) is introduced into an evacuated vessel at 233K, the

equilibrium concentration of Br2(g) is found to be 0.241M. Calculate the concentration of NOBr in the

equilibrium mixture.

And I got negative number for x value, it seems wrong.

Please help me, I would be greatly appreciated!!!

[Borek]

Please show your ICE tables, hard to guess what may have gone wrong not seeing your work.