Question

2. A polymer contains 10 molecules with
molecular mass 10,000 and 10 molecules with
molecular mass 1,00,000. Calculate number
- average molecular mass.​

Answer 1

Answer:

average molecular mass =

10×100000 +10×10000/20

100000+1000000/20

1100000/20

110000/2

55000

Answer 2

The average molecular mass of a polymer containing 10 molecules with

molecular mass 10,000 and 10 molecules with molecular mass 1,00,000 is equal to 55,000.

• The average molecular mass of the polymer is defined as the sum of the mass of all the molecules divided by the total number of molecules.
• The total mass of the 20 molecules is equal to (10*10,000 + 10*1,00,000) = 11,00,000
• The total number of molecules present in the polymer is equal to 20.
• Hence the average molecular mass of the polymer is equal to (11,00,000/20 = 55,000)