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Question
Calculate the empirical formula of the compound having 37.6% sodium, 23.1% silicon and 39.3% oxygen.(Answer correct to two decimal places) (O = 16, Na = 23, Si = 28)
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Solution
| Element | Atomic mass | Percentage | Relative number of moles | Simplest mole ratio | Whole number ratio |
| Na | 23 | 37.6 | 37.6/23 = 1.63 | 1.63/0.83 = 1.9 | 2 |
| Si | 28 | 23.1 | 23.1/28 = 0.83 | 0.83/0.83 = 1 | 1 |
| O | 16 | 39.3 | 39.3/16 = 2.45 | 2.45/0.83 = 2.9 | 3 |
So the empirical formula of the compound is Na2SiO3.
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