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) A)2.6 g B)0.26 g C)580 g D)260 g E)1.3 g

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Quizplus · Accepted Answer

First, convert the person's weight from pounds to kilograms: 120 lb / 2.2 lb/kg = 54.545 kg. Then, convert the weight to grams: 54.545 kg × 1000 g/kg = 54545 g. The substance makes up 4.8 × 10^-4 percent of this mass, so calculate: 54545 g × (4.8 × 10^-4 / 100) = 0.261 g, which is approximately 0.26 g.

A Certain Substance Makes Up 4