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  • 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). (i) Express this in per cent by mass.

1.17: A sample of drinking water was found to be severely contaminated with chloroform, CHCl3, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).

 (i) Express this in per cent by mass.

Answers (1)

best_answer

1 ppm means 1 part in a million(10^6) parts.

So, in percentage by mass:

We have, 

Percentage\ by\ mass = \frac{15}{10^6}\times 100 = 15\times10^{-4}

= 1.5\times10^{-3}\%

 

 

Posted by

Divya Prakash Singh

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