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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. (ii) Determine the molality of chloroform in the water sample.

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(a)

Mass percent of 15 ppm chloroform in H2O=  

100 grams of the sample is having 1.5 × g of

∴ 

= 

Molar mass (​)

= 12 + 1 + 3 (35.5)

= 119.5 grams 

 

Therefore, molality of  water

= m