wayoftheyetigirl
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Calculating equilibrium pressure. Just need someone to check my math.
in Homework Help
Posted
I've done all the work, I just keep coming up wrong on my math. I'm not sure what I'm missing.
The equilibrium constant, Kp, for the following reaction is 0.636 at 600 K:
COCl2(g) CO(g) + Cl2(g)
Calculate the equilibrium partial pressures of all species when COCl2(g) is introduced into an evacuated flask at a pressure of 1.73 atm at 600 K.
PCOCl2=
PCO=
PCl2=
setting up ICE, I know that Kp=x/(1.73-x)=.636
(.636)[1.73-x]^2=x
(.636)[1.73^2-2(1.73)x + x^2]=x
(.636)x^2-[2(1.73)(.636)+1]x + (.636)(1.73)^2
x^2-[2(1.73)+1/(.636)]x + 1.73^2= 0
a=1
b= -[2(1.73)+1/(.636)]= -5.032
c= (1.73)^2= 2.993
quadratic equation such that:
[(-5.032)^2-4(2.993)]^1/2 = [13.349]^1/2= 3.654
x=(-(-5.032)+-3.654)/2
x=4.343 or .689
Go with .689 since the other value of x is greater than the initial pressure of 1.73.
PCO=PCL2=(1.73-x)=(1.73-.689)=1.041
PCOCL2=x=.689