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=4.60 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=0.780

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?

Please show how you got both answers, thank you so much!!

Explanation / Answer

                      2COF2(g)CO2(g)+CF4(g)

           I          2                   0             0

          C          -2x             +x               +x

         E          2-2x             +x              +x

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

             4.6     = x*x/(2-2x)2

           4.6      = (x/2-2x)2

           2.14      = x/2-2x

           2.14*(2-2x)   = x

                x   = 0.81

   [CF4] = x = 0.81M

[COF2] = 2-2x = 2-2*0.81 = 0.38M

part-B

   Kc=0.780

                      CO(g)+NH3(g)HCONH2(g),  

       I                1         2                0

       C               -x       -x                +x

      E              1-x      2-x                +x

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

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

                 0.78*(1-x)(2-x) = x

               x   = 0.533

           [CONH2] = x = 0.533M

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