Manganese makes up 1.3 × 10–4 percent by mass of the elements found in a normal healthy body. How many grams of manganese would be found in the body of a person weighing 274 lb? (2.205 lb = 1 kg) 56 g

Answer 1

Body mass in g = 274 lb x 1 kg/2.205 lb x 1000 g/kg = 124,263 g = 1.24x10⁵ g

1.3x10-4 percent = 1.3x10-6 as a decimal

1.3x10^-6 x 1.24x10⁵ = 0.16 g Mn