JAMB Chemistry 2013 Objective — Question 30

Question 30 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

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

A. [H2]⁴/[H2O]⁴Correct
B. [Fe]³[H2O]⁴/[Fe3O4][H2]⁴
C. [Fe3O4][H2]⁴/[Fe][H2O]⁴
D. [H2O]⁴/[H2]⁴

Explanation

For a heterogeneous equilibrium, species in the solid and liquid phases are not featured in the expression for the equilibrium constant. K = [H2]⁴/[H2O]⁴.

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