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Question

At a certain temperature, equilibrium constant (Kc) is 16 for the reaction:
SO2(g)+NO2(g)SO3(g)+NO(g)
If we take 1 mole of each of the four gases in 1 L container, what would be the equilibrium concentration of NO and NO2?

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Solution

SO2(g)+NO2(g)SO3(g)+NO(g)

Initial concentration: 1 1 1 1
Equi. Concentration: 1x 1x 1+x 1+x

Applying law of mass action,

Kc=[SO3][NO][SO2][NO2]=(1+x)(1+x)(1x)(1x)=16

1+x1x=4

or 5x=3

x=35=0.6

Conc. of NO2 at equilibrium=(10.6)=0.4 mole
Conc. of NO at equilibrium=(1+0.6)=1.6 mole

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