Answer
See the answer below.
Work Step by Step
a) The concentration of CO is $1.0\ mol\div 200.0\ L=0.005\ M$, and of CO2 is $0.20\ mol\div 200.0\ L=0.001\ M$
The equilibrium constant is given by:
$K=[CO]^2/[CO_2]$
$K=(0.001\ M)^2\div0.005\ M=0.0002$
b, c) It would be the same, the concentration of solids isn't computed in the equilibrium constant.
