IB Chemistry HL 2.3.2 Equilibrium law Question Bank

Practise IB Chemistry HL 2.3.2 by applying equilibrium law to exam-style questions.

Exam points

identify the relevant chemical structure, process or evidence
apply the correct chemical model or equation
evaluate the result using chemical reasoning and data

[Maximum number: 1]

When nitrogen gas and hydrogen gas are allowed to react in a closed container the following equilibrium is established.

\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) \quad \Delta H=-92.6 \mathrm{~kJ}

Deduce the equilibrium constant expression, $K_{\mathrm{c}}$ , for the reaction on page 10.

$\left(K_{\mathrm{c}}=\right) \frac{\left[\mathrm{NH}_{3}(\mathrm{~g})\right]^{2}}{\left[\mathrm{~N}_{2}(\mathrm{~g})\right] \times\left[\mathrm{H}_{2}(\mathrm{~g})\right]^{3}}$ ;

Marking guidance:

Ignore state symbols.
Concentrations must be represented by square brackets.

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2.3.2—Equilibrium law question 1