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Glucose (C6H12O6) is a monomer that can form naturally occurring polymers - HSC - SSCE Chemistry - Question 6 - 2006 - Paper 1
Question 6
Glucose (C6H12O6) is a monomer that can form naturally occurring polymers. The approximate atomic weights for the elements which make up glucose are shown in the ta... show full transcript
Worked Solution & Example Answer:Glucose (C6H12O6) is a monomer that can form naturally occurring polymers - HSC - SSCE Chemistry - Question 6 - 2006 - Paper 1
Step 1
Calculate the molecular weight of one glucose monomer
Answer
To find the molecular weight of one glucose monomer (C6H12O6), we use the atomic weights from the table:
- Carbon: 6 atoms × 12 = 72
- Hydrogen: 12 atoms × 1 = 12
- Oxygen: 6 atoms × 16 = 96
Thus, the molecular weight of one glucose monomer is:
Step 2
Calculate the molecular weight of 5 glucose monomers
Answer
Now, we multiply the molecular weight of one glucose monomer by the number of monomers:
However, in forming a polymer, two hydrogen and one oxygen atom are released for each glycosidic bond formed. In a polymer made from 5 monomers, there are 4 bonds formed, resulting in:
- Hydrogen: 12 - 4 = 8
- Oxygen: 6 - 1 = 5
Thus, the adjusted molecular weight of the polymer:
- Carbon: 6 × 12 = 72
- Hydrogen: 8 × 1 = 8
- Oxygen: 5 × 16 = 80
Therefore, the total adjusted molecular weight is:
So, we calculate the final weight for 5 monomers:
Step 3