A cosmetic product contains four esters, A, B, C, and D, which are analyzed by gas chromatography and mass spectrometry. The results are summarized in the table below:
| Ester | Retention time / minutes | Relative peak area (relative molar proportion) | m/z m/z\,m/z of molecular ion peak |
|---|---|---|---|
| A | 2.1 | 3.5 | 152 |
| B | 3.2 | 3.8 | 166 |
| C | 4.1 | 1.2 | 180 |
| D | 4.4 | 5.4 | 180 |
The concentration of ester B in the cosmetic product is 7.15 × 10-2 g dm-3.
Using the results, calculate the concentration, in mol dm−3\text{mol dm}^{-3}mol dm−3, of active ester D in the cosmetic product.
Give your answer to two significant figures.
6 exam-style questions on OCR A A Level Chemistry Chromatography and qualitative analysis. Each one has a worked solution and a mark scheme showing where the marks go.