Ans :- Equilibrium concentration of CO2 =
0.11997 M
Explanation :-
The ICE table for the given reaction is :
.......................NiO(s)............+.......................CO(g)
<----------->
Ni(s)..............+.................CO2(g)
Initial
(I)..........................................................0.12000
M....................................................0.0 M
Change
(C).......................................................-
y...............................................................+
y
Equilibrium
(E).............................................(0.12000-y)
M....................................................y M
y = Number of moles dissociated per mole = ?
Expression of equilibrium constant i.e. Kc for the
given reaction is :
Kc = [CO2 (g)] / [CO(g)]
NOTE :- Concentration of pure liquids and
solids are considered as constant while writing the expression of
Kc.
4000.0 = y / (0.12000-y)
y = 480 - 4000.0 y
4001 y = 480
y = 0.11997 M
Hence, equilibrium concentration of CO2 = y =
0.11997 M
