OCR 2023 Chemistry

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OCR 2023 Chemistry 1

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OCR 2023 Chemistry A H032/02: Depth in chemistry AS Level Question Paper & Mark Scheme (Merged) Q5 g] >>> A polyester is formed from 200 molecules of 4-hydroxybenzoic acid. What is the relative molecular mass, Mr , of the polyester ? - ANSWER -1. Structure of 4 - hydroxybenzoic acid >>> 2. Mr of 4 - hydroxybenzoic acid: 138 3. 138 x 200 = 27600 4. There are [n-1] molecules of water lost, so there are 199 molecules of water lost 5. 27600 - [199 x18] =24018 *The Mr o...

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OCR 2023 Chemistry • OCR 2023 Chemistry