if polymer sample contain two monodisperse fractions in the ratio2:3 with degree of polymerisation 100 and 200 then its weight AVG molecular at?
Answer (1)
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
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