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# A sample of drinking water was found to be severely contaminated with chloroform CHCl_3 supposed to be a carcinogen.The level of contamination was 15 ppm (by mass):(ii) determine the molality of chloroform in the water sample.

Q. 2.9 A sample of drinking water was found to be severely contaminated with chloroform $\inline (CHCl_{3})$  supposed to be a carcinogen. The level of contamination was $\inline 15\; ppm$ (by mass):

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

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Moles of chloroform  :

$=\frac{15}{119.5} = 0.1255\ mol$

Mass of water is $10^6$.      (Since contamination is 15 ppm)

So molality will be :

$=\frac{0.1255}{10^6}\times1000 = 1.255\times10^{-4}\ m$

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