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

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=6.50

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=0.660

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

2COF2(g) <------------------> CO2(g) + CF4(g)

2.00 M 0 0

2 - 2x x x

Kc = [CO2][CF4] / [COF2]^2

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

x = 0.84

[COF2] at equilibrium = 2 - 2x = 2 - 2x0.84 = 0.33 M

[COF2] = 0.33 M

part B)

CO(g)+NH3(g) <--------------> HCONH2(g)

1 2 0

1 - x 2-x x

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

0.660 = x / x^2-3x+2

x = 0.5

equilibrium concentration of [HCONH2] = x = 0.5 M

equilibrium concentration of [HCONH2] = 0.5 M

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