A-LevelChemistryReaction kineticsMay/June 2025Paper 1 Q91 Mark
Aqueous hydrogen peroxide, H2O2, decomposes into water and oxygen in the presence of a suitable catalyst. 50 cm³ of a 0.50 mol dm⁻³ solution of hydrogen peroxide produced 120 cm³ of oxygen in 2.0 minutes. The volume of gas was measured at room conditions. What is the average rate of decomposition of hydrogen peroxide during this 2.0 minute period?
A0.000083 mol dm⁻³ s⁻¹
B0.00083 mol dm⁻³ s⁻¹
C0.0017 mol dm⁻³ s⁻¹
D0.10 mol dm⁻³ s⁻¹
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The correct answer is C. This question tests the candidate's understanding of reaction kinetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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