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(C(2)F(4))n s a polymeric substance wher...

`(C_(2)F_(4))_n` s a polymeric substance where n is a large number. It is prepared by polymerisation of `C_(2)F_4` in presence of sulphur catalyst. The final product is found to contain 0.012% of S. find the value of n if the polymeric molecule contains three S-atoms.

Text Solution

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Since 1 molecule of the polymer contains 3 atoms of S, 1 gram-mole of the polymer should contain 3 gram-atoms orr `3xx32g` of sulphur.
Now, 0.012 g of sulphur is present in 100g of polymer.
`therefore3xx32` g of sulphur is present in `(100xx3xx32)/(0.012)`
`=8xx10^(5)g` off polymer
`therefore`Molecular mass off the polymer`=8xx10^(5)`
Again, molecular formula of the polymer`=(C_(2)H_(4))_(n)`
`therefore`Molecular mass`=n(2xx12+4xx19)=100n`
or, `100n=8xx10^(5)" "thereforen=8000`
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