Question

The most common type of molecular weights used in the case of polymer is :

• A. number average molecular weight method
• B. z - average molecular weight method
• C. viscosity average molecular weight method
• D. all of the above

Answer 1

Answer: (A)

number average molecular weight method

The most common type of molecular weights used in the case of polymers is number average molecular weight method.
It gives the relationship between the number of moles of each polymer species ($N_i$) and the molar mass ($M_i$) of that species as, $M_n=\frac{\Sigma M_i{N}_i}{\Sigma Ni}$.