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

Question

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=6.90

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

B)Consider the reaction

CO(g)+NH3(g)HCONH2(g),    Kc=0.750

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

a) 2COF2(g) <----> CO2(g)+CF4(g),    Kc=6.90

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

6.9 = (x*x)/(2-2x)^2

x = 0.84

at equilibrium,

[COF2] = 2-2*0.84 = 0.32 M

b)

CO(g)+NH3(g) <---> HCONH2(g),    Kc=0.750

Kc = [HCONH2]/[CO][NH3]

0.75 = X/((1-X)(2-X))

X = 0.525

at equilibrium,

[HCONH2] = X= 0.525 M

[NH3] = 2-X = 2-0.525 = 1.475 M

[CO] = 1-X = 1-0.525 = 0.475 M

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