I really need help here guys!!!!

Here is the question:

For the following reaction

Kc = 255 at 1000 K

CO(g) + Cl

_{2}(g)

COCl

_{2} (g)

A reaction mixture initially contains a CO concentration of 0.1490 M and a Cl

_{2} concentration of 0.174 M at 1000 K.

What is the equilibrium concentration of CO at 1000 ?

What is the equilibrium concentration of Cl

_{2 }at 1000 ?

What is the equilibrium concentration of COCl

_{2} at 1000 ?

ok. ive tried this prob a number of times and even asked some people in my class and everyone comes up with the same number. and its wrong. i know you guys here can figure out what i am doing wrong....

CO(g) + Cl

_{2}(g)

COCl

_{2} (g)

I: .1490M .174M 0

C: -x -x +x

E: .1490 - x .174-x x

---------------------------------------------------------------

x/(.1490-x)(.174-x) = 255

x/255(.0259 -.323x+x

^{2})

6.60-82.4x+255x

^{2} = x

6.60-83.4x+255x

^{2} = 0

through the quadratic equation, i get

x= .193 or x= .134

since x cannot be greater than the original concentration, i picked .134

Substituting back in for x,

.1490-.134 = .0150

sig figs aside, i put the following answers in and they were all wrong:

5.00×10−3

1.50×10−2

1.50×10−2

1.40×10−2 Not quite. Check through your calculations; you may have made a rounding error or used the wrong number of significant figures.

1.50×10−2

so, could it be .013? note the message that came up when i tried .014. i tried the equation in about 5 or 6 different quadratic equation solvers and got .134 on all of them except for one, where i got .133. when i substitute back in with .133, i get .016 as an answer. i havent attempted .016 as an answer, but the message leads me to believe its closer to .014 than .016. and i only have one attempt left, so i, er, have to be right. Oh, and when i did the quadratic by hand, i came out with .015. can anyone tell me what i am doing wrong? i would really hate to get this wrong due to a rounding error, but i am certain that i have the concept correct. any info at all is much appreciated. esp if i am messing up my sig figs.