Lactose at a glance
| Property | Value |
|---|
| Molar mass | 342.297 g/mol |
|---|
| Molecular weight | 342.297 u |
|---|
| Chemical formula | C12H22O11 |
|---|
| Monoisotopic mass | 342.116212 u |
|---|
| CAS number | 5965-66-2 |
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| PubChem CID | 6134 |
|---|
How to calculate the molar mass of lactose
12 × 12.011 + 22 × 1.008 + 11 × 15.999 = 342.297 g/mol
- Count the atoms in C12H22O11: C 12, H 22, O 11.
- Multiply each atom count by the atomic weight of the element.
- Add the results to get 342.297 g/mol.
Elemental composition of lactose
| Element | Atoms | Atomic weight | Mass (g/mol) | Mass % |
|---|
| C Carbon | 12 | 12.011 | 144.132 | 42.107% |
|---|
| H Hydrogen | 22 | 1.008 | 22.176 | 6.4786% |
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| O Oxygen | 11 | 15.999 | 175.989 | 51.414% |
|---|
Grams and moles of lactose
| Amount | Equals |
|---|
| 1 g | 0.0029214 mol |
|---|
| 10 g | 0.029214 mol |
|---|
| 100 g | 0.29214 mol |
|---|
| 0.1 mol | 34.23 g |
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| 1 mol | 342.3 g |
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| 1 g, in particles | 1.7593 × 10^21 |
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Calculate other compounds