GATE 2021 MT – Question 33
Polyethylene’s degree of polymerization is 30000. Its average molecular weight is ______ g/mol (nearest integer). Atomic weights of C and H are 12 and 1.
Practise this question in The GATE Grind →
Show answer and explanation
Correct answer: 840000 to 840000
Explanation
The repeat unit C2H4 has molar mass 2×12+4=28 g/mol. Multiply by degree of polymerization 30000 to obtain **840000 g/mol**, neglecting the tiny end-group contribution.