Carbonyl fluoride. COF_2, is an Important Intermediate used In the production of
ID: 941801 • Letter: C
Question
Carbonyl fluoride. COF_2, is an Important Intermediate used In the production of fluorine-containing compounds For Instance. It Is used to make the refrigerant carbon tetrafluoride. CF_4 via the reaction 2COF_2(g) CO_2(g) + CF_4(g), K_c = 6.50 If only COF_2 is present Initially at a concentration of 2.00 M what concentration of COF_2 remains at equilibrium? Express your answer with the appropriate units. Consider the reaction CO(g) + NH_3 (g) HCONH_2 (g), K_c = 0.810 If a reaction vessel initially contains only CO and NH_3 at concentrations of 1.00 M and 2.00 M respectively, what will the concentration of HCONH_2 be at equilibrium? Express your answer with the appropriate units.Explanation / Answer
A) 2COF2 ---------> CO2 + CF4 Kc = 6.5
Initial 2 M 0 0
at equilibrium 2-2x x x
Kc = x.x /(2-2x)2
6.5 = x2 /(2-2x)2
2.55 = x / 2-2x
5.1 - 5.1 x = x
6.1 x = 5.1
x = 0.836 M
Therefore,
equilibrium concentration of COF2 = 2-2x = 2- 2 (0.836) = 0.328 M
B) CO + NH3 ----------> HCONH2 Kc = 0.81
Initial 1 M 2M 0
at equilibrium 1-x 2-x x
Kc = x / (1-x) (2-x)
0.81 = x / 2-3x +x2
0.81 x2 - 2.43 x + 1.62 = x
0.81 x2 - 3.43 x + 1.62 = 0
On solving ,
x = 0.542 M
Therfore,
concentration of HCONH2 at equilibrium = x = 0.542 M