Question

NiO(s)+CO(g)⇌Ni(s)+CO2(g)
Kc=4000.0 at 1500 K

If a mixture of solid nickel(II) oxide and 0.12000 M carbon monoxide is allowed to come to equilibrium at 1500 K, what will be the equilibrium concentration of CO2?

Answer 1

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. K_c for the given reaction is :

K_c = [CO₂ (g)] / [CO(g)]

NOTE :- Concentration of pure liquids and solids are considered as constant while writing the expression of K_c.

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