A certain public water supply contains 0...

A certain public water supply contains `0.10ppb` (part per billion) of chloroform `(CHCl_3)`. How many molecules of `CHCl_3` would be obtained in `0.478 mL` drop of this water ?(assumed `d=1g per mL`)

`4xx10^(-13)xxN_(A)`

`10^(-3)xxN_(A)`

`4xx10^(-10)xxN_(A)`

None of these

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