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What will be the molality of chloroform in the water sample which contains 15 ppm chloroform by mass?
  • a)
    1.25 x 10-4 m
  • b)
    2.5 x 10-4 m
  • c)
    1.5 x 10-3 m
  • d)
    1.25 X 10-5 m
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
What will be the molality of chloroform in the water sample which cont...
15 ppm = 15/106 x 102 = 1.5 x 10-3g
Molality of CHCl3 solution = 1.5 x 10-3/100 x 1000/119.5
= 1.25 x 10-4 m
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Most Upvoted Answer
What will be the molality of chloroform in the water sample which cont...
Molality Calculation for Chloroform in Water Sample

Given:
Mass of Chloroform (m) = 15 ppm = 15 mg/kg
Molar mass of Chloroform (M) = 119.38 g/mol
Density of Water (d) = 1 g/mL

Step 1: Convert mass of Chloroform to moles
Number of moles of Chloroform = Mass / Molar Mass
n = m/M = 15 mg / 119.38 g/mol = 1.26 x 10^-4 mol

Step 2: Calculate mass of water in kg
Mass of water = Volume x Density = 1 L x 1 g/mL = 1 kg

Step 3: Calculate molality
Molality (m) = Number of moles / Mass of solvent (in kg)
m = n / (mass of water in kg)
m = 1.26 x 10^-4 mol / 1 kg = 1.26 x 10^-4 mol/kg

Therefore, the molality of chloroform in the water sample which contains 15 ppm chloroform by mass is 1.25 x 10^-4 m. The correct answer is option A.
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What will be the molality of chloroform in the water sample which contains 15 ppm chloroform by mass?a)1.25 x 10-4 mb)2.5 x 10-4 mc)1.5 x 10-3md)1.25 X 10-5 mCorrect answer is option 'A'. Can you explain this answer?
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