Molar Mass Calculator
Find the molar mass of any chemical formula — brackets and hydrates included — with each element's share.
Molar mass
74.092 g/mol
- Atoms per formula unit
- 5
- Different elements
- 3
Atomic weights: CIAAW abridged standard atomic weights (2024).
Mass by element
| Element | Atoms | Atomic weight | Mass (g/mol) | Mass % |
|---|---|---|---|---|
| Calcium (Ca) | 1 | 40.078 | 40.078 | 54.092% |
| Oxygen (O) | 2 | 15.999 | 31.998 | 43.187% |
| Hydrogen (H) | 2 | 1.008 | 2.016 | 2.721% |
Show the work
Multiply each element's atom count by its atomic weight
mass = atoms × atomic weight
Ca: 1 × 40.078; O: 2 × 15.999; H: 2 × 1.008 = 40.078 + 31.998 + 2.016
Add them up
M = Σ atoms × atomic weight
40.078 + 31.998 + 2.016 = 74.092 g/mol
How it works
Molar mass = Σ (atoms of each element × its standard atomic weight), using the CIAAW 2024 abridged atomic weights
Questions
- How does the molar mass calculator work?
- Molar mass = Σ (atoms of each element × its standard atomic weight), using the CIAAW 2024 abridged atomic weights.
- What do I need to enter?
- Chemical formula. Optional fields can be left blank.
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