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A sample of drinking water was found to ...

A sample of drinking water was found to be severely contaminated with chloroform. `CHCl_(3)`, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass). Express this is percent by mass.

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15 ppm indicates 15 parts in `10^(6)` parts.
therefore, mass percent`=(15xx100)/(10^(6))=1.5xx10^(-3)`.
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