Reaction is
co2(g) + c(s) < => 2co(g)
kp = 5.7, 1200k

calcualte the total pressure at equilibrium when 4.45g co2 is introduced into a 10.0l container and heated to 1200k in the presence of 2.00g of graphite

According  to the task, you  are proveded with patial pressure of CO2 and graphite, and here is complete solution for the task :
At first you have to find n1 =moles of CO2 and n2 which are moles of C 
The you go :


n1 n2 0
-x -x +2x

After that you have to use the formula
 
Then you have to solve x, and for that you have to use RT/V
And to find total values:
I am absolutely sure that this would be helpful for you.