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15/05/2026
13/05/2026

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 percent by mass.

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

29/04/2026
21/04/2026

Why do non-metals exhibit variable valency?

17/04/2026

question answer practise mole concept for 11,p1

14/04/2026

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