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=8.40

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

Part B

Consider the reaction

CO(g)+NH3(g)?HCONH2(g),    Kc=0.690

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?

Explanation / Answer

a)2COF2(g) <--> CO2(g) + CF4(g), Kc=8.40
initial conc 2 0 0
change -2x +x +x
Equb conc 2-2x x x

Equilibrium constant , Kc = ([CF4][CO2] ) / [COF2]^2
8.40 = x*x / (2-2x)^2
---> x / (2-2x) = sq(7.2)
= 2.898
--> x = 0.852

what concentration of COF2 remains at equilibrium = 2-2x = 0.294 M

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