AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

If polythene sample contains two monodisperse fractions in the ratio 2: 3with degree of polymerization 100 and 200. Respectively. Then its weight average molecular weight will be

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

answer is 4900.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Degree of polymerization of 1 polymer=100
Degree of polymerization of II polymer=200

N 1 = 2 : N 2 = 3

Molar mass of monomer (ethylene) of polythene=28g/mol
Now, degree of polymerization is given as

D P = Molar mass of monomer Molar mass of polymer

Thus, Molar mass of I polymer

M 1 = 100 × 28 = 2800 g / mol

Molar mass of II polymer

M 2 = 200 × 28 = 5600 g / mol

Now, the weight average molecular weight is given as:

M w = ∑ n i M i 2 ∑ n i M i

∴ M w = n i M 12 + n 2 M 22 n 1 M 1 + n 2 M 2 = 2 (2800) 2 + 3 (5600) 2 2 × 2800 + 3 × 5600 = 4900 g / mol

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!