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Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance,...

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=7.30 If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium?

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Expert Solution


                    [COF2]              [CO2]               [F2]              


initial             2.0                 0                   0                 

change              -2x                 +1x                 +1x               

equilibrium         2.0-2x              +1x                 +1x               

Equilibrium constant expression is
Kc = [CO2]*[F2]/[COF2]^2
7.3 = x^2/(2.0-2x)^2
sqrt(7.3) = x/(2.0-2x)
2.70 = x/(2.0-2x)
5.40 - 5.40*x = x
6.40*x = 5.40
x = 0.844 M


At equilibrium:
[COF2] = 2.0-2x = 2.0-2* 0.844 = 0.312 M

Answer: 0.312 M

queen_honey_blossom answered 3 years ago
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