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Question: > What will be the molality of chloroform in the water sample which contains 15 ppm chloroform by ma...

What will be the molality of chloroform in the water sample which contains 15 ppm chloroform by mass?

A

1.25×10−4m1.25 \times 10^{- 4}m

B

2.5×10−4m2.5 \times 10^{- 4}m

C

1.5×10−3m1.5 \times 10^{- 3}m

D

1.25×10−5m1.25 \times 10^{- 5}m

Answer

1.25×10−4m1.25 \times 10^{- 4}m

Explanation

Solution

(1) : 15 ppm =15106×102=1.5×10−3g= \frac{15}{10^{6}} \times 10^{2} = 1.5 \times 10^{- 3}g

Molality of CHCl3CHCl_{3}solution =1.5×10−3100×1000119.5= \frac{1.5 \times 10^{- 3}}{100} \times \frac{1000}{119.5}

= 1.25×10−4m1.25 \times 10^{- 4}m