Fluoro carbon polymers can be made by fluorinationg polythene.
(i) `(CH_(2))_(n) + 4n Co F_(3) rarr (CF_(2))_(n) + 2 nHF + 4 nCoF_(2)`
Where `n` is large integer. The `CoF_(3)` can be regenarted by the above reaction.
(ii) `2CoF_(2) + F_(2) rarr 2CoF_(3)`
If `HF` can be recovered and electrolyzed to `H_(2)` and if `F_(2)`, is used for regenerating `CoF_(3)`, what is the net consuption of `F_(2)` for `1.0 g` of `(CF_(2))_(n)`.

Options

A. `1.0 g`
B. `1.26 g`
C. `0.76 g`
D. `1.5 g`

Answer

C

Explanation

If `4nCoF_(3)` yields `4nCoF_(2)`, `4nF` atoms are consumed. Saving `2 nF` atoms by recovery of the `F` from `HF` reduces the comsumption by half.
Hence, `(1.52)/(2) = 0.76 g` of `F_(2)` is required.