Question
Asked Oct 31, 2019

The EPA limit for lead in bare soil for children’s play areas is 400 ppm by mass. A contractor is delivering 1171 kg of soil to a new play area. What is the maximum mass of lead (in grams) allowed in the soil delivery?

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Step 1

Parts per million or ppm is term used to express concentration. It is somewhat similar to weight percent, except multiply the mass ratio by 1,000,000 instead of 100.

mass of solute
- x106
mass of solution
ppm
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mass of solute - x106 mass of solution ppm

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Step 2

As per the data given in the question,

ppm of bare soil by mass = 400

mass of solution = 1171 kg

As per the conversion factor, 1 kg = 1000 g

Therefore, mass of solution = 1.171×106 g

Step 3

On substituting all the values in t...

mass of lead
x106
1.171 x 10g
400
mass of lead 468.4 g
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mass of lead x106 1.171 x 10g 400 mass of lead 468.4 g

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