Answer
$m = 42.08 g/mol$
Work Step by Step
Required:
The repeat unit molecular weight of polypropylene.
Solution:
Each repeat unit consists of 3 carbons and 6 hydrogens. Computing the repeat unit molecular weight:
$m = 3(A_{C}) + 6(A_{H})= 3(12.011 g/mol) + 6(1.008 g/mol) = 42.08 g/mol$
