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Question
A compound X consists of 4.8% carbon and 95.2% bromine by mass. Determine the empirical formula of this compound working correctly to one decimal place (C = 12; Br = 80).
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Solution
| Element | % age | Atomic mass | % age atomic mass | Simplest atomic ratio | Simplest whole no. ratio |
| Carbon | 4.8 | 12 | `4.8/12` = 0.40 | `0.40/0.40` = 1 | 1 |
| Bromine | 95.2 | 80 | `95.2/80` = 1.19 | `1.19/0.40` = 3 | 3 |
Empirical formula of the compound = C1Br3 or CBr3.
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