Answer:
C. 0.5
Explanation:
Given that
Molecular mass= 10,000 g/mol
DP= 200
Molecular weight of vinyl chloride = 62.5 g/mol
Molecular weight of vinyl acetate = 86 g/mol
Lets take mole fraction of vinyl chloride is x
And mole fraction of vinyl acetate is (1-x)
As we know that
Mass = number of mole x molecular wight
For vinyl chloride
Mass of vinyl chloride=62.5 x
For vinyl acetate
Mass of vinyl acetate =86(1-x)
Total mass(mass of monomer) = 62.5 x + 86 (1-x) ----1
We know that total weight of polymer given as
total weight of polymer = DP x Mass of monomer
10,000 =200(62.5 x + 86 - 86 x)
23.5 x = 36
x=1.53
This can not be possible .because be assumed that x is less than 1.
If we replace 10,000 by 15,000 then
15,000 =200(62.5 x + 86 - 86 x)
75 =62.5 x + 86 - 86 x
x=0.46
x=0.5
So the answer C is correct.
