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If a natural rubber has a molecular weig...

If a natural rubber has a molecular weight of 20,400 then the no. of repeating units in the polymer is `x xx 10^(y).(x+y)` is equal to

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The correct Answer is:
5
Natural Rubber Monomer is isoprene , `CH_(2) = underset(CH_(2))underset(|)(C)-CH=CH_(2)`, 2-Methyl-1,3-Butadiene
M-F `= C_(5)H_(8)`, Mwt = 68.
No. of monomers `= (20,400)/(68) = 300 = 3 xx 10^(2)`
`x xx 10^(y) = 3 xx 10^(2) , x + y = 3+2 = 5`
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