Carbonyl fluoride, , is an important intermediate used in the production of fluo

Question

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

2COF2(g) --- CO2(g) + CF4(g) Kc=5.60

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

Explanation / Answer

2 COF2(g) ? CO2(g) + CF4(g), => Kc = [CO2] · [CF4] / [COF2]² with Kc = 6.10 One mole of either carbon dioxide as of carbon fluoride are formed per 2 moles of carbonyl fluoride decomposed. Let x be the amount of COF2 decomposed and set up ICE table:, that means the rate of change Set up ICE table ----COF2-------CO2----------Cl2 I-----2.0----------0--------------0 C---(-x)-------(+x/2)-------(+x/2) E-(2.0-x)------(x/2)----------(x/2) Plug in the equilibrium concentrations to equilibrium condition and solve for x: 5.6 = (x/2) · (x/2) / (2.0-x)² 22.4 = x²/(2.0-x)² v22.4 = x/(2.0-x) x = 2.0 · v22.4 / ( 1 + v22.4) = 1.65 M Hence the equilibrium concentration of carbonyl fluoride is: [COF2] = 2.0M - 1.65M = 0.35M

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