Question

Lead is a toxic substance. 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 6.0 103 g of blood (the amount in an average adult) if the lead content is 0.66 ppm?

Answer 1

Answer : 0.0040 grams of lead is contained in the blood of an average adult human being.

Explnanation :

The lead content is given as 0.66 ppm.

That means there are 0.66 grams of lead in 1 million grams of blood.

Let us use this as a conversion factor as, $\frac{0.66g Lead}{10^{6}g Blood}$

We have 6.0 x 10³ grams o blood. Te amount of lead in this is calculated as follows.

$6.0 \times 10^{3} g Blood \times \frac{0.66g Lead}{10^{6} g Blood} = 3.96 \times 10^{-3} g Lead = 4.0 \times 10^{-3} g Lead$

0.0040 grams of lead is contained in the blood of an average adult human being.