The value of Kc for the dissociation reaction : 

H2(g) ⇌ 2H(g) is 1.2 × 10-42 at 500 K.

Does the equilibrium mixture contain mainly hydrogen molecules or hydrogen atoms?

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1 Answers

When the value of KC is very low (that is, KC < 10-3), then at equilibrium, only a small fraction of the reactants is converted into products. 

For the given reaction,

KC <<< 10 at 500 K. 

Hence,

The equilibrium mixture contains mainly hydrogen molecules.

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