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JIPMER 2015
Exam
JIPMER
Year
2015
Subject
Chemistry
Chapter
Polymers

JIPMER 2015 · Chemistry · Polymers

The number average molar mass and mass average molar mass of a...

The number average molar mass and mass average molar mass of a polymer are respectively 30,000 and 40,000 . The polydispersity index (PDI) of the polymer is

Options

  1. A−1-1
  2. B00
  3. C>1\gt1
  4. D<1\lt 1

Correct answer

C. >1\gt1

Step-by-step solution

Polydispersity index (PDI) = Mass average molar mass  Number average molar mass =MWMn40,00030,000=1.3>1\begin{array}{r}=\frac{\text{ Mass average molar mass }}{\text{ Number average molar mass }}=\frac{M_W}{M_n} \\ \qquad \frac{40,000}{30,000}=1.3>1\end{array}
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