Question
Explain: Molar mass.
✓
Answer
i. The mass of one mole of a substance (element/compound) in grams is called its molar mass.
ii. The molar mass of any element in grams is numerically equal to atomic mass of that element in u. e.g.
ii. The molar mass of any element in grams is numerically equal to atomic mass of that element in u. e.g.
| Element | Atomic mass (u) | {:[" Molar mass "(g],[{:mol^(-1))]:} |
| H | 1 | 10 |
| C | 12 | 12 |
| O | 16 | 16 |
iii. Similarly, molar mass of polyatomic molecule, in grams is numerically equal to its molecular mass or formula mass in u.
e.g.
| Polyatomic substance | Molecular/formula mass (u) | Molar mass (gmol^(-1)) |
| O_(2) | 32 | 32 |
| H_(2)O | 18 | 18 |
| NaCl | 58.5 | 58.5 |
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