Question

The mass average molecular mass & number average
molecular mass of a polymer are 40,000 and 30,000
respectively. The polydispersity index of polymer will be
(a) < 1 (b) > 1 (c) 1 (d) 0

Answer 1

$\huge\bold\red{Answer:-}$

(b) > 1

Answer 2

The polydispersity index of polymer will be less than one.

Correct option - "b".

Step by step explanation:

• PDI (Polydispersity Index) is the ratio of the mass average molecular mass to the number average molecular mass.

From the given,

The mass average molecular mass of polymer   = 40,000

The number average  molecular mass of a polymer = 30000

Let's calculate the Polydispersity Index:

                    $PDI =\frac{mass \,average\, molecular \,mass }{number\.average\,molecular\, mass}$

                  $Therefore, PDI = \frac{40000}{30000}= 1.33$

Hence, The polydispersity index of polymer will be less than one.

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