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Three mixtures were prepared from three monodispersed polystyrene samples (with molar masses of 10,000, 30,000,

and 100,000 g/mol) as indicated below:

(a) equal numbers of molecules of each sample,
(b) equal masses of each sample, and
(c) by mixing in the mass ratio 0.145: 0.855 the two samples with molar masses of 10,000 and 100,000 g/mol.

For each mixture calculate the number-average, weight-average molar mass and polydispersity.

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