A-LevelChemistryEquilibria9701/12 · May/June 2023 · Q141 Mark
Hydrogen iodide is added to an evacuated reaction vessel. The vessel is sealed and warmed. A decomposition reaction occurs. Hydrogen and iodine are formed. Some hydrogen iodide remains. When equilibrium is established, the total pressure is 1.20 × 10⁵ Pa. The partial pressure of hydrogen is 4.00 × 10³ Pa. Hydrogen iodide, hydrogen and iodine are all gaseous under the conditions used. What is the value of Kp for the equilibrium at this temperature, assuming the decomposition is the forward reaction?
A1.19 × 10⁻³
B1.28 × 10⁻³
C1.38 × 10⁻³
D1.43 × 10⁻³
✓ Correct answer
B: 1.28 × 10⁻³
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