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Question

Choose the correct unit of equilibrium constant (Kc) for the given reaction.
C(s)+12O2(g)CO(g)

A
mol/L
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B
(mol/L)32
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C
(mol/L)12
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D
(mol/L)12
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Solution

The correct option is D (mol/L)12
Equilibrium constant Kc is proportional to the active masses of the products and reactants.
C(s)+12O2(g)CO(g)
For this reaction, Kc=[CO][O2]12
Active mass of solids are considered as 1.
where [CO], [O2]12 are the molar concentations having a unit of mol/L
So, unit of Kc=mol/L(mol/L)12
Kc=(mol/L)12

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