Chemistry 0620 · 3 Stoichiometry
3.2 Relative masses of atoms and molecules
Define and calculate relative atomic mass (Ar) and relative molecular/formula mass (Mr), and calculate reacting masses in simple proportions.
- Questions
- 168
- Years
- 2011–2026
- Multiple choice
- 96
- Written answer
- 72
- Average marks
- 5.1
Where this subtopic appears
- Paper 1variants 11, 12, 1373
- Paper 3variants 31, 32, 3350
- Paper 2variants 21, 22, 2332
- Paper 4variants 41, 42, 4310
- Paper 6variants 61, 622
- Paper 5variants 531
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | 3 | 8 | – | 11 |
| 2024 | – | 1 | – | 1 |
| 2023 | 1 | 7 | 8 | 16 |
| 2022 | 4 | 12 | 1 | 17 |
| 2021 | 4 | 7 | 7 | 18 |
| 2020 | – | 1 | 14 | 15 |
| 2019 | 2 | 7 | 8 | 17 |
| 2018 | 5 | 8 | 6 | 19 |
| 2017 | 2 | 5 | 6 | 13 |
| 2016 | 2 | 9 | 1 | 12 |
| 2015 | – | 1 | 2 | 3 |
| 2014 | – | 3 | 2 | 5 |
| 2013 | – | 2 | 4 | 6 |
| 2012 | – | 2 | 6 | 8 |
| 2011 | – | 3 | 4 | 7 |
