A polymeric sample in which 30% molecules have a molecular mass 20,000 , 40% have 30,000 and the rest 30% have 60,000 . The (M̅n) and (M̅w) of this sample are, respectively:
![materials - How do I calculate weight/number average relative molecular mass for polymers? - Chemistry Stack Exchange materials - How do I calculate weight/number average relative molecular mass for polymers? - Chemistry Stack Exchange](https://i.stack.imgur.com/XjNZy.png)
materials - How do I calculate weight/number average relative molecular mass for polymers? - Chemistry Stack Exchange
![Calculate the average molecular mass of a polymer sample in which 30% molecules have a molecular mass 20,000, 40% have 30,000, and rest have 60,000. Strategy: Work out number average molecular mass ( Calculate the average molecular mass of a polymer sample in which 30% molecules have a molecular mass 20,000, 40% have 30,000, and rest have 60,000. Strategy: Work out number average molecular mass (](https://d10lpgp6xz60nq.cloudfront.net/ss/web/338197.jpg)