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(A) The number average molecular mass $(\overline{M}_n)$ is calculated using the formula: $\overline{M}_n = \frac{\sum N_i M_i}{\sum N_i}$ Here,$N_1 =

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$2 	imes 10^4$

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(A) The number average molecular mass $(\overline{M}_n)$ is calculated using the formula: $\overline{M}_n = \frac{\sum N_i M_i}{\sum N_i}$ Here,$N_1 = 10$,$M_1 = 5,000$ and $N_2 = 5$,$M_2 = 50,000$. $\sum N_i M_i = (10 	imes 5,000) + (5 	imes 50,000) = 50,000 + 250,000 = 300,000$. $\sum N_i = 10 + 5 = 15$. $\overline{M}_n = \frac{300,000}{15} = 20,000 = 2 	imes 10^4$.

$A$ polymer sample contains $10$ molecules each with molecular mass $5,000$ and $5$ molecules each with molecular mass $50,000$. The number average molecular mass of the polymer sample is

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