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JAMB Chemistry 2013 Paper

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Question : 36

Total: 44

Choose the correct option from the graph above . 3Fe_(S) + 4H₂O_(g) ⇌ Fe₃O_4(s) + 4H_2(g). The equilibrium constant, K, of the reaction above is represented as

A
B
C
D

Solution:

Concept:

Pure solids are omitted from the equilibrium constant expression.

Explanation:

For the reaction:

3\mathrm{Fe}_{(s)} + 4\mathrm{H}_2\mathrm{O}_{(g)} \rightleftharpoons \mathrm{Fe}_3\mathrm{O}_{4(s)} + 4\mathrm{H}_{2(g)}

Solids

\mathrm{Fe}

and

\mathrm{Fe}_3\mathrm{O}_4

are not included in

K

.

Only gases

\mathrm{H}_2

and

\mathrm{H}_2\mathrm{O}

appear.

So,

K = \frac{[\mathrm{H}_2]^4}{[\mathrm{H}_2\mathrm{O}]^4}

This is represented by the correct option.

Answer:

The option showing

\dfrac{[\mathrm{H}_2]^4}{[\mathrm{H}_2\mathrm{O}]^4}

is correct.

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