Potassium Alum at a glance
| Property | Value |
|---|
| Molar mass | 474.372 g/mol |
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| Molecular weight | 474.372 u |
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| Chemical formula | KAl(SO4)2·12H2O |
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| Monoisotopic mass | 473.975481 u |
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| CAS number | 7784-24-9 |
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| PubChem CID | 62667 |
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How to calculate the molar mass of potassium alum
1 × 39.098 + 1 × 26.982 + 2 × 32.06 + 20 × 15.999 + 24 × 1.008 = 474.372 g/mol
- Count the atoms in KAl(SO4)2·12H2O: K 1, Al 1, S 2, O 20, H 24.
- Multiply each atom count by the atomic weight of the element.
- Add the results to get 474.372 g/mol.
Elemental composition of potassium alum
| Element | Atoms | Atomic weight | Mass (g/mol) | Mass % |
|---|
| K Potassium | 1 | 39.098 | 39.098 | 8.2421% |
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| Al Aluminum | 1 | 26.982 | 26.982 | 5.6879% |
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| S Sulfur | 2 | 32.06 | 64.12 | 13.517% |
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| O Oxygen | 20 | 15.999 | 319.98 | 67.453% |
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| H Hydrogen | 24 | 1.008 | 24.192 | 5.0998% |
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Grams and moles of potassium alum
| Amount | Equals |
|---|
| 1 g | 0.0021081 mol |
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| 10 g | 0.021081 mol |
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| 100 g | 0.21081 mol |
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| 0.1 mol | 47.437 g |
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| 1 mol | 474.37 g |
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| 1 g, in particles | 1.2695 × 10^21 |
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