Formula to calculate weight average molecular mass of polymer is :

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$\frac{\sum_{n = 1}^{i} M_{i} N_{i}^{2}}{\sum_{n = 1}^{i} M_{i} N_{i}}$

$\frac{\sum_{n = 1}^{i} M_{i} N_{i}}{\sum_{n = 1}^{i} M_{i}}$

$\frac{\sum_{n = 1}^{i} M_{i}^{2} N_{i}}{\sum_{n = 1}^{i} M_{i} N_{i}}$

$\frac{\sum_{n = 1}^{i} M_{i} N}{\sum_{n = 1}^{i} N_{i}}$

answer is D.

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Detailed Solution

Weight average molecular mass of polymer is:

$\frac{\sum_{n = 1}^{i} M_{i}^{2} N_{i}}{\sum_{n = 1}^{i} M_{i} N_{i}}$

Here, N_i and M_i is the number of molecules and molar mass of the molecules present in the sample polymer.

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