Question

A sample of drinking water was found to be severely contaminated with chloroform supposed to carcinogenic the level of contamination was 15ppm by mass
i)Express this in percent by mass
ii) Determine the molality of CHCL3 in the water sample.​

Answer 1

Answer:

15 ppm means 15 parts in million (106) parts by mass in solution  

∴ % by mass =  15 10 6 15106 × 100 = 15 × 10-4

 Taking 15 g chloroform in 106g

 Molar mass of CHCl3 = 12 + 1 + 3 × 35.5 = 119.5 g mol-1

 Molality =  15 119.5 10 6 15119.5106 × 1000 = 1.25 × 10-4

Answer 2

Answer:

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