Question

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 .​

Answer 1

Answer:

See answer in above picture

Answer 2

Answer:

MOLAR MASS OF CHCL3 = 119.5

CONTAMINATION = 15ppm

MEANS 15g OF CHCL3 IS PRESENT IN 10^6 g OF SOLUTION

MASS% =  (MASS OF SOLUTE /MASS OF SOLUTION) *100

MASS% = 15/10^6 *100

SO MASS% = 1.5*10^-3

MOLALITY = NO OF MOLES OF SOLUTE/MASS OOF SOLVENT (IN KG)

MASS OF SOLVENT = 10^6 - 15   (SOLUTION = SOLUTE+SOLVENT)

MOLES OF SOLUTE = 15/119.5

HENCE-->  MOLALITY = 15/119.5  X1000/10^6

SO MOLALITY = 1.255 x 10^-4

HOPE THE SOLUTION WAS HELPFUL 2 U....

                                   

Explanation: