The concentrations of reactants and products for a chemical reaction can be calc

Question

The concentrations of reactants and products for a chemical reaction can be calculated if the equilibrium constant for the reaction and the starting concentrations of reactants and or products are known. 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 = 6.80 If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium? Express the molar concentration numerically. Consider the reaction CO(g) + NH3(g) HCONH2(g), Kc = 0.820 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 the molar concentration numerically.

Explanation / Answer

   We Know that :       The given Reaction is :          2COF2 ( g ) <--------> CO2 (g ) + CF4 ( g )     I:        2.0M                          0 M                 0 M     C:        - 2x                           +x                   + x      E :     2.0 - 2x                         +x                  + x                                             Kc =   [ CO2 ] [ CF4] / [ COF2 ]^2                        6.80 = [ x ] ^2 / [ 2.0 - 2 x ]^2             solving the above equation we get :                   x = 0.83871 M          The Concentration of COF2 remains unreacted is   0.1288 M                   Thegiven equation is :          CO + NH3   <--------> HCONH2     I :  1.0         2.0                       0     C :   -x          -x                      + x     E :   1 -x        2 -x                    + x                                                                 Kc = [ HCONH2 ] / [ CO ] [ NH3]                                                            0.820   = x / [ 1- x ] [ 2- x ]                    solving the above equation we get :                x = 0.5441 M         Theequilibrium concentration of [ HCONH2 ] = 0.5441M      

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