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=4.40 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=0.680

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

part A)

2COF2(g)    <------------->   CO2(g) +   CF4(g),    Kc=4.40

2.00                                      0                 0

2 - 2x                                     x                   x

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

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

x = 0.8075

concentration of COF2 = 2 - (2 x 0.8075)

concentration of COF2 = 0.385 M

part B)

CO(g) + NH3(g) <-------------> HCONH2(g),    Kc=0.680

1.0          2.00                                 0

1 - x        2-x                                    x

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

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

x = 0.504

concentration of HCONH2 = 0.504 M

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