ABC26PH1185 · Polymer Chemistry

Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Molecular Weight Averages · Exam: NET DEC 2015 · Marks: 2 · Difficulty: Medium

The correct expression for the product $\left(\left(\overline{\mathrm{M}}_{\mathrm{n}}\right) \cdot\left(\left(\overline{\mathrm{M}}_{\mathrm{w}}\right)\right)\right)\left[\left(\left(\overline{\mathrm{M}}_{\mathrm{n}}\right.\right.\right.$ and $\left(\left(\overline{\mathrm{M}}_{\mathrm{w}}\right.\right.$ are the number average and weight average molar masses, respectively, of a polymer] is
(a)$\mathrm{N}^{-1} \sum_{\mathrm{i}} \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}$
(b)$\mathrm{N}^{-1} \sum_{\mathrm{i}} \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}^{2}$
(c)$\mathrm{N} / \sum_{\mathrm{i}} \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}$
(d)$\mathrm{N} / \Sigma_{\mathrm{i}} \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}^{2}$
Answer
Answer (as printed): B
Explanation
No explanation was printed for this question.

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