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Polymer molecules can be made by joining together large numbers of small molecules called monomers - Edexcel - GCSE Chemistry - Question 3 - 2019 - Paper 1
Question 3
Polymer molecules can be made by joining together large numbers of small molecules called monomers. Figure 5 shows the names and structures of some polymers and the... show full transcript
Worked Solution & Example Answer:Polymer molecules can be made by joining together large numbers of small molecules called monomers - Edexcel - GCSE Chemistry - Question 3 - 2019 - Paper 1
Step 1
Complete the table using the information given.
Answer
Name of polymer: poly(ethene)
Structure of polymer molecule:
Name of monomer: ethene
Structure of monomer molecule:
Name of polymer: poly(chloroethene)
Structure of polymer molecule:
Name of monomer: chloroethene
Structure of monomer molecule:
Name of polymer: poly(tetrafluoroethene)
Structure of polymer molecule:
Name of monomer: tetrafluoroethene
Structure of monomer molecule:
Step 2
Step 3
Step 4
Calculate the relative formula mass of the poly(propene) molecule made from joining together 24 600 molecules of propene, C₃H₆.
Answer
To calculate the relative formula mass of poly(propene):
- The molar mass of propene (C₃H₆) = 3(12.01) + 6(1.01) = 42.08 g/mol.
- For 24,600 molecules:
- Number of moles = 24600 / 6.022 x 10²³ = 4.08 x 10⁻² moles.
- Total mass = number of moles x molar mass = 4.08 x 10⁻² moles x 42.08 g/mol ≈ 1.72 g.