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Q.

If a polythene sample contains two monodisperse fractions in the ratio 2:3 with degree of polymerization 100 and 200 respectively, then its weight average molecular weight will be:

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answer is 4900.

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Detailed Solution

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$M_{1} = 2800; M_{2} = 5600 {\bar{M}}_{w} = \frac{2 \times 2800^{2} + 3 \times 5600^{2}}{2 \times 2800 + 3 \times 5600} = 4900$

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