Water at a glance
| Property | Value |
|---|
| Molar mass | 18.015 g/mol |
|---|
| Molecular weight | 18.015 u |
|---|
| Chemical formula | H2O |
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| Monoisotopic mass | 18.0105647 u |
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| CAS number | 7732-18-5 |
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| PubChem CID | 962 |
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How to calculate the molar mass of water
2 × 1.008 + 1 × 15.999 = 18.015 g/mol
- Count the atoms in H2O: H 2, O 1.
- Multiply each atom count by the atomic weight of the element.
- Add the results to get 18.015 g/mol.
Elemental composition of water
| Element | Atoms | Atomic weight | Mass (g/mol) | Mass % |
|---|
| H Hydrogen | 2 | 1.008 | 2.016 | 11.191% |
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| O Oxygen | 1 | 15.999 | 15.999 | 88.809% |
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Grams and moles of water
| Amount | Equals |
|---|
| 1 g | 0.055509 mol |
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| 10 g | 0.55509 mol |
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| 100 g | 5.5509 mol |
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| 0.1 mol | 1.8015 g |
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| 1 mol | 18.015 g |
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| 1 g, in particles | 3.3428 × 10^22 |
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Calculate other compounds