CAIE IGCSE Chemistry Relative Molecular and Formula Mass
Practise calculating relative molecular or formula mass from a chemical formula and using a known total to determine an atom count or unknown element.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- multiply each relative atomic mass by its formula subscript and add all contributions
- use relative molecular mass for molecules but relative formula mass for ionic lattices
- rearrange a relative-mass total to find an atom count or identify an unknown element
3.2.2—Relative molecular mass, Mr, as the question 1
[Maximum number: 1]
What is the relative molecular mass, Mr, of sulfur dioxide?
A
24
B
32
C
48
D
64
D
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