1. Carbonyl fluoride, COF2, is an important intermediate used in the production
ID: 1041258 • Letter: 1
Question
1. 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=6.20 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
2. Consider the reaction CO(g)+NH3(g)?HCONH2(g), Kc=0.650 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)
ICE Table:
[COF2] [CO2] [CF4]
initial 2.0 0 0
change -2x +1x +1x
equilibrium 2.0-2x +1x +1x
Equilibrium constant expression is
Kc = [CO2]*[CF4]/[COF2]^2
6.2 = (1*x)^2/(2-2*x)^2
sqrt(6.2) = (1*x)/(2-2*x)
2.48998 = (1*x)/(2-2*x)
4.97996-4.97996*x = 1*x
4.97996-5.97996*x = 0
x = 0.83277
At equilibrium:
[COF2] = 2.0-2x = 2.0-2*0.83277 = 0.33445 M
Answer: 0.334 M
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