logo

Ask Questions, Get Answers

 
X
 Search
Want to ask us a question? Click here
Browse Questions
Ad
Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Polymers
0 votes

The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000.The polydispersity index of the polymer is

$\begin{array}{1 1}(a)\;< 1&(b)\;> 1\\(c)\;1&(d)\;0\end{array}$

Can you answer this question?
 
 

1 Answer

0 votes
Given :
$\bar{M_w}$ of the polymer =40,000
$\bar{M_N}$ of the polymer =30,000
Poly dispersity index (PDI) of a polymer is
PDI=$\large\frac{\bar{M_w}}{\bar{M_N}}$
$\Rightarrow \large\frac{40000}{30000}$
$\Rightarrow 1.33 > 1$
Hence (b) is the correct answer.
answered Mar 14, 2014 by sreemathi.v
 

Related questions

Ask Question
student study plans
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...