A-LevelChemistryEquilibria9701/12 · Oct/Nov 2020 · Q101 Mark

Sulfur dioxide and oxygen react to form sulfur trioxide. The reaction is reversible. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) Kp = 2.96 × 10⁻⁹ Pa⁻¹ at 700 °C The reaction is allowed to reach equilibrium at 700 °C. The partial pressure of O₂(g) is 375 kPa and the partial pressure of SO₃(g) is 20.3 kPa. What is the partial pressure of SO₂(g)?

A19.3 kPa

B609 kPa

C18 300 kPa

D609 000 kPa

✓ Correct answer

B: 609 kPa

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Topic: Equilibria, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 2, question 10.

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