A computer model tracks the formation of a polyester.
| Quantity | Number of molecules or chains |
|---|---|
| Diol molecules that react | 240 |
| Dicarboxylic acid molecules at the start | 240 |
| Dicarboxylic acid molecules that do not react | 4 |
| Separate polyester chains formed | 4 |
How many molecules of water are formed?
Show your working.
131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.