Question

A certain substance makes up 4.8 × 10–4 percent by mass of a normal healthy human being. How many grams of that substance would be found in the body of a person weighing 120 lb? (1.0 kg = 2.2 lb).

Answer 1

Answer:

0.2615 g

Explanation:

Given that mass of the body = 120 lb

The conversion of lb to g is shown below as:-

1 lb = 454 g

So, 120 lb = 120*454 g = 54480 g

The substance is $4.8\times 10^{-4}\ \%$ of the human body

So, Mass of that substance in the body of mass 54480 g is:-

$m=\frac{4.8\times 10^{-4}}{100}\times 54480\ g=0.2615\ g$

0.2615 g of that substance would be found in the body of a person weighing 120 lb.