AP EAMCET201822 Apr 2018Evening ShiftChemistryPolymersActual
The polydispersity index of a polymer containing 10 molecules with molecular mass 1.0 10^4 and 10 molecules with molecular mass 1.0 10^5 is approximately.
Options
- A1.67
- B0.59
- C1.55
- D0.83
Correct answer
A. 1.67
Step-by-step solution
The PDI (polydispersity index) = M_w M_n =1.67M_w= Weight average molecular weight. M_n= Number average molecular weight. aligned & M_n= N₁ M₁+N₂ M₂ N₁+N₂ =55,000 & M_w= N₁ M₁^2+N₂ M₂^2 N₁ M₁+N₂ M₂ =91818 aligned