Types of formula for organic molecules
4 marks · NormalThe table shows some information about four organic compounds.
| Compound | Molecular formula | Empirical formula |
|---|---|---|
| butane | C4H10 | |
| ethyne | C2H2 | |
| pentene | CH2 | |
| cyclopropane | CH2 |
Complete the table. One compound may have more than one possible answer.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Common mistakes: Using structural instead of empirical formula; Inverting C:H ratios
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Marking points
B1 · 1 mark · Empirical formula for butane is C2H5.
B2 · 1 mark · Empirical formula for ethyne is CH.
B3 · 1 mark · Molecular formula for pentene is C5H10.
B4 · 1 mark · Molecular formula for cyclopropane is C3H6.
Worked solution
| Compound | Molecular formula | Empirical formula |
|---|---|---|
| butane | C4H10 | C2H5 |
| ethyne | C2H2 | CH |
| pentene | C5H10 | CH2 |
| cyclopropane | C3H6 | CH2 |