The "normal" lead content in human blood is about 0.40 part per million (i. e., 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 10^3 g of blood (the amount in an average adult) if the lead content is 0.62 ppm?

3.7 * 10⁻³ g Pb

Explanation:

0.62 parts per million means that there are 0.62 g of lead per million grams of blood (10⁶ grams of blood). In order to find the grams of lead on 6.0 * 10³ grams of blood (the amount in an average adult), we will use a conversion fraction.

6.0 * 10³ g blood * (0.62 g Pb / 10⁶ g blood) = 3.7 * 10⁻³ g Pb

in 6.0 E3 g of blood at a concentration of 0.62 ppm there are 3.5g of lead content

Explanation:

blood density: 1.06 g/L ppm ≡ mg Pb / L blood

⇒ V blood = 6.0E3gblood * L / 1.06gblood = 5660.37 L blood

mass of lead:

⇒ 5660.37 L blood * 0.62 mg Pb / L blood * 0.001 g / mg

⇒ mass = 3.509 g of lead