Answer to Question #246169 in General Chemistry for Chansa

Question

The “normal” lead content in human blood is about 0.40 part per million (that is, 0.40 g of lead per million grams of blood). A value of 0.80 part per million (ppm) is considered to be dangerous. How many grams of lead are contained in 6.0 x 103 g of blood (the amount in an average adult) if the lead content is 0.62 ppm?

Answer 1

Explanation:

At ppm concentrations we do not have pfaff around with units of density or changes to volume upon dilution...

1⋅mg⋅L^-1 is called one part per million

because there are

1000×1000⋅mg

=1 million milligrams

in ONE LITRE of water...

And so we gots

600⋅g of blood...which is 0.60⋅L

to a first approx...

So (finally!),

mass of lead=60 ppm×0.60⋅L≡60⋅mg⋅L^-1×0.60⋅L

=36⋅mg