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JAMB Chemistry 2013 Question 30

Question 30

Chemical Equilibrium

3Fe(s) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g)
The equilibrium constant, K, of the reaction above is represented as

  1. A.[Fe3O4][H2]/[Fe][H2O]
  2. B.[H2O]4/[H2]4
  3. C.[H2]4/[H2O]4
  4. D.[Fe]3[H2O]2/[Fe3O4][H2]4
Show the answer and explanation

Answer: C ([H2]4/[H2O]4)

Explanation

Solids are left out of K, and products go on top raised to their coefficients: K = [H2]4/[H2O]4.