Butanedioic acid, HOOC−CH2CH2−COOH\mathrm{HOOC-CH_{2}CH_{2}-COOH}HOOC−CH2CH2−COOH, reacts with ethane-1,2-diol, HO−CH2CH2−OH\mathrm{HO-CH_{2}CH_{2}-OH}HO−CH2CH2−OH, to form a polyester. Each repeating unit contains one unit from each monomer.
What is the relative formula mass of the repeating unit?
(relative atomic masses: C = 12, H = 1, O = 16)
180
162
144
126
37 exam-style questions on Edexcel GCSE Chemistry 10.3 Polymers, covering 10.3.1 Addition polymerisation of alkenes, 10.3.2 Uses and properties of polymers, 10.3.3 Condensation polymers and polyesters, 10.3.4 Problems with polymers and recycling, and 10.3.5 Natural polymers: DNA, starch and proteins. Each one has a worked solution and a mark scheme showing where the marks go.