CBSE Class 11-science Answered
ppm is equivalent to part per million by weight.i.e by level of contamination is 15 ppm we mean that if 1 kg of water s taken then content of CHCl3 is 15 × 10-6 kg.
Now no. of moles of CHCl3 = 15 × 10-3 /119.5=n(let)
then molality = n/(1-15 × 10-6)
Putting the value of n we get the molality of chloroform in solution.
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