Chemistry 5070 · 3 Stoichiometry
3.2 Relative masses of atoms and molecules
Define and calculate relative atomic mass (Ar) and relative molecular/formula mass (Mr) based on the carbon-12 scale.
- Questions
- 94
- Years
- 2005–2026
- Multiple choice
- 66
- Written answer
- 28
- Average marks
- 3.8
Where this subtopic appears
- Paper 1variants 01, 11, 1261
- Paper 4variants 04, 41, 4223
- Paper 2variants 02, 218
- Paper 3variants 032
Questions by year
| Year | May/June | Oct/Nov | Total |
|---|---|---|---|
| 2026 | 2 | – | 2 |
| 2023 | 7 | 3 | 10 |
| 2022 | 4 | 1 | 5 |
| 2021 | 5 | 2 | 7 |
| 2020 | 3 | 4 | 7 |
| 2019 | 5 | 3 | 8 |
| 2018 | 5 | 3 | 8 |
| 2017 | 2 | 4 | 6 |
| 2016 | 1 | – | 1 |
| 2015 | 5 | – | 5 |
| 2014 | 1 | 2 | 3 |
| 2013 | 3 | 1 | 4 |
| 2012 | – | 2 | 2 |
| 2011 | 1 | – | 1 |
| 2009 | 2 | 3 | 5 |
| 2008 | 2 | 4 | 6 |
| 2007 | 3 | 2 | 5 |
| 2006 | 4 | – | 4 |
| 2005 | 2 | 3 | 5 |
