Question

Drinking water was found to be served real call morning and chloroform supposed to be credited in nature nature the revolt of contamination with 15 PPM by mass

Answer 1

1 ppm is equivalent to 1 part out of 1 million (106) parts.

∴ Mass percent of 15 ppm chloroform in water

(ii) molality (M) = no of moles of solute/mass of solvent in g *1000

Therefore mass of chloroform= 12 + 1+3(35.5) = 119.5 g/mol

100 g of the sample contains 1.5 × 10–3 g of CHCl3.

⇒ 1000 g of the sample contains 1.5 × 10–2 g of CHCl3.

m = 1.5 x 10-3/119.5 * 1000 = 1.25x 10-4 m

I know your question is incomplete.

But I have studied this question in earlier classes.So on basis of that I have answered your question.