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Polyesters and polyamides

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Question 1

A biodegradable polyester is synthesised by the condensation polymerisation of exactly 450 molecules of 3-hydroxypentanoic acid, CH3CH2CH(OH)CH2COOH\text{CH}_3\text{CH}_2\text{CH(OH)CH}_2\text{COOH}CH3​CH2​CH(OH)CH2​COOH, to form a single continuous polymer chain.

a.

Write the structural formula of one repeat unit of this polyester.

[1]
b.

Calculate the relative molecular mass, MrM_rMr​, of the resulting polyester.

Use the following relative atomic masses: H=1.0H = 1.0H=1.0, C=12.0C = 12.0C=12.0, O=16.0O = 16.0O=16.0. Show your working.

[3]

Polyesters and polyamides Questions

  1. A Level
  2. /Chemistry
  3. /Polyesters and polyamides