If you tell me (e.g., Organic Synthesis, Energetics, or Buffers) from the 2021 paper you're struggling with, I can provide a more detailed step-by-step explanation . Everything you need to know about A Level H2 Chemistry
: Buffers, partial pressures in gas equilibria, and thermodynamic calculations. Organic Chemistry A Level H2 Chemistry 2021 Paper 3 Answers