question archive Knowledge Check on Molality ! Direction: Solve the given problem

Knowledge Check on Molality ! Direction: Solve the given problem

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Knowledge Check on Molality ! Direction: Solve the given problem. You may use a separate sheet
of paper. A commercial pesticide formulation contains 1.0 g deltametrin in 1L solution . What is its
concentration in ppm ? Given : Solution :

pur-new-sol

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1000ppm

Step-by-step explanation

The mass of solute given= 1g

Volume of solution 1L

Parts per million ppm= mass of solute/Mass of solution= 1/1000000

Assuming a density of 1 g/mL for the solution and

1L=1000ml

mass of solution= 1g/mL x 1000mL=1000g

so

1g/1000g=1/1000000

but ppm=0.000001

so

ppm=1g/1000g x 1000000=1000ppm

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