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Number average molecular mass of a polymer that contains 15 molecules with each of mass, 8,000 and 15 molecules with each of mass 80,000 is
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Verified Answer
The correct answer is:
44,000
Number average molecular mass of polymer is given by formula:
\(\begin{aligned}
M_n & =\frac{\Sigma N_i M_i}{\Sigma N_i} \\
& =\frac{15 \times 8000+15 \times 80,000}{30} \\
& =\frac{120000+1200000}{30} \\
& =\frac{1320000}{30}=44,000
\end{aligned}\)
\(\begin{aligned}
M_n & =\frac{\Sigma N_i M_i}{\Sigma N_i} \\
& =\frac{15 \times 8000+15 \times 80,000}{30} \\
& =\frac{120000+1200000}{30} \\
& =\frac{1320000}{30}=44,000
\end{aligned}\)
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