Chemistry
The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9% phosphorus and 39% oxygen. Find the empirical formula of the compound?
Mole Concept
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Answer
| Element | % composition | At. wt. | Relative no. of atoms | Simplest ratio |
|---|---|---|---|---|
| sodium | 42.1 | 23 | = 1.83 | = 3 |
| phosphorus | 18.9 | 31 | = 0.609 | = 1 |
| oxygen | 39 | 16 | = 2.43 | = 4 |
Simplest ratio of whole numbers = Na : P : O = 3 : 1 : 4
Hence, empirical formula is Na3PO4
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