plumiHess’s law: CAIE A‑Level Chemistry questions
Every CAIE A-Level Chemistry exam question on 5.2 Hess’s law, June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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Calculations
Q4(b)(ii)
The whole paper ↗![June 2024 Paper 2, question 4(b)(ii): Use the data in Table 4.1 to calculate the enthalpy change of reaction, ∆Hr , in kJ mol–1, for reaction 2. Show your working. ∆Hr = kJ mol–1 [2] [Total: 6]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970121-jun24-04-bii-qp.webp)
All 3 questions on Hess’s law, as a list
- June 2024, Paper 1, Q9 (1 mark): An energy cycle is shown. CH4 + 2O2 X Y C + 2H2 + 2O2 CO2 + 2H2O Z The energy changes involved are X, Y and Z. The numerical value of energy change Y is either
- June 2024, Paper 2, Q4(b)(ii) (2 marks): Use the data in Table 4.1 to calculate the enthalpy change of reaction, ∆Hr , in kJ mol–1, for reaction 2. Show your working. ∆Hr = kJ mol–1 [2] [Total: 6]
- Specimen, Paper 1, Q9 (1 mark): Which expression gives the standard enthalpy change of combustion of methane? A (CH4) + (CO2) – 2 (H2O) B (CO2) + 2 (H2O) + (CH4) C (CH4) + 2 (H2O) – (CO2) D (C
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