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Date May 2017 Marks available 1 Reference code 17M.1.sl.TZ2.18
Level SL Paper 1 Time zone TZ2
Command term Deduce Question number 18 Adapted from N/A

Question

What is the equilibrium constant expression, Kc, for the following reaction?

2NH3(g) + 2O2(g) \( \rightleftharpoons \) N2O(g) + 3H2O(g)

A.     \(\frac{{3\left[ {{{\text{H}}_2}{\text{O}}} \right]\left[ {{{\text{N}}_2}{\text{O}}} \right]}}{{2\left[ {{\text{N}}{{\text{H}}_3}} \right]2\left[ {{{\text{O}}_2}} \right]}}\)

B.     \(\frac{{{{\left[ {{\text{N}}{{\text{H}}_3}} \right]}^2}{{\left[ {{{\text{O}}_2}} \right]}^2}}}{{\left[ {{{\text{N}}_2}{\text{O}}} \right]{{\left[ {{{\text{H}}_2}{\text{O}}} \right]}^3}}}\)

C.     \(\frac{{2\left[ {{\text{N}}{{\text{H}}_3}} \right]2\left[ {{{\text{O}}_2}} \right]}}{{3\left[ {{{\text{H}}_2}{\text{O}}} \right]\left[ {{{\text{N}}_2}{\text{O}}} \right]}}\)

D.     \(\frac{{\left[ {{{\text{N}}_2}{\text{O}}} \right]{{\left[ {{{\text{H}}_2}{\text{O}}} \right]}^3}}}{{{{\left[ {{\text{N}}{{\text{H}}_3}} \right]}^2}{{\left[ {{{\text{O}}_2}} \right]}^2}}}\)

Markscheme

D

Examiners report

[N/A]

Syllabus sections

Core » Topic 7: Equilibrium » 7.1 Equilibrium
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