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if polymer sample contain two monodisperse fractions in the ratio2:3 with degree of polymerisation 100 and 200 then its weight AVG molecular at?


Ambatiraja 31st Oct, 2019
Answer (1)
Upendra Gupta 1st Nov, 2019

The average molecular weight of the sample will be (b) 4600

Explanation:

The average molecular weight is given by the relation,

W = (WM + WM)/(W + W)

W = 2

W = 3

M = molar mass of 1st fraction = 100 x 28 = 2800

M = molar mass of 1st fraction = 200 x 28 = 5600

putting these values in the given eqn

W = (2x2800 + 3x5600)/(2+3)

= (5600 + 16800)/5

= 22400/5

= 4480

≈ 4600

Hence the average molecular weight of the sample will be 4600

1 Comment
Comments (1)
2nd Nov, 2019
thank u sir
Reply

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