Q. 2.9 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.

Answers (1)

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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