Part A Carbonyl fluoride, COF2, is an important intermediate used in the product

Question

Part A

Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction

2COF2(g)CO2(g)+CF4(g),    Kc=4.70

If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium?

Express your answer with the appropriate units.

Part B

Consider the reaction

CO(g)+NH3(g)HCONH2(g),    Kc=0.630

If a reaction vessel initially contains only CO and NH3 at concentrations of 1.00 M and 2.00 M, respectively, what will the concentration of HCONH2 be at equilibrium?

Express your answer with the appropriate units.

Explanation / Answer

1)2COF2(g)CO2(g)+CF4(g),    Kc=4.70

2M 0 0   

2-2x x x

Kc = x^2 / (2-2x)^2

= 4.70(2-2x)^2 = x^2

= solving the quadratic we get x1= 0.81 and x2 = 1.30

x2 is not a valid solution

so COF2 = 2-2x = 2-2*.81 = 0.38 M

2)

CO(g)+NH3(g)HCONH2(g),    Kc=0.630

1 2 0

1-x 2-x x

= Kc = x/ (1-x)(2-x)

= 1.58x^2 = x^2 -3x+2

= 0.58x^2 +3x -2 = 0

x = 0.597 M

Therefore the concentration of HCONH2 = 0.597 M

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