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Three mixtures were prepared with very narrow molar mass distribution polyisoprenesamples with molar masses of 8000, 25,000, and 100,000 as indicated below.
(a) Equal numbers of molecules
(b) Equal masses of sample
(c) Equal viscosities of sample dissolved in tetrahydrofuran
(K = 19.5 L g-1, a = 0.73)
For each of the samples, calculate the number-average and weight-average molar mass, and comment on the meaning of the values obtained.
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The mean height of eight children is 136cm. if the height of seven children are 143,125,133,140,120,135 and 152,find the height of eighth student.
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