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 :
(a) 4900
(b) 4600
(c) 4300
(d) 5200
Answers
Answered by
6
Answer:
The average molecular weight of the sample will be (b) 4600
Explanation:
The average molecular weight is given by the relation,
W = (W₁M₁ + W₂M₂)/(W₁ + W₂)
W₁ = 2
W₂ = 3
M₁ = molar mass of 1st fraction = 100 x 28 = 2800
M₂ = 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 (b) 4600
Answered by
6
Answer: 4900 g/mol
Explanation:
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