Question

Molecular weight (g/mol) of polypropylene with a degree of polymerisation of 1000 (rounded off to nearest integer) is ________________.

Hint:

To calculate the molecular weight of a polymer, multiply the degree of polymerisation by the molecular weight of a single monomer unit.

Answer 1

Correct Answer: 42000

The molecular weight of polypropylene can be calculated by multiplying the degree of polymerisation by the molecular weight of a single unit of polypropylene. The molecular weight of a single unit (CH2-CH) is approximately 42 g/mol. Thus, for a degree of polymerisation of 1000, the molecular weight is: \[ M_{\text{polypropylene}} = 1000 \times 42 = 42,000\ \text{g/mol} \] Thus, the molecular weight of polypropylene is: \[ \boxed{42000\ \text{g/mol}} \]