The natural abundances of elements in the human body, expressed as percent by mass, are oxygen (o), 65 percent; carbon (c), 18 percent; hydrogen (h), 10. percent; nitrogen (n), 3.0 percent; calcium (ca), 1.6 percent; phosphorus (p), 1.2 percent; all other elements, 1.2 percent. enter your answers in scientific notation. calculate the mass in grams of each element in the body of a 64−kg person.

O: 4.2 × 10⁴ g

C: 1.2 × 10⁴ g

H: 6.4 × 10³ g

N: 1.9 × 10³ g

Ca: 1.0 × 10³ g

P: 7.7 × 10² g

Other elements: 7.7 × 10² g

Explanation:

Natural abundances of elements in the human body (in percent by mass)

The mass of a body is 64 kg = 64 × 10³ g = 6.4 × 10⁴ g. We can calculate the mass of each element by multiplying the body weight by the mass percent of each element.

O: 6.4 × 10⁴ g × 65% = 4.2 × 10⁴ g

C: 6.4 × 10⁴ g × 18% = 1.2 × 10⁴ g

H: 6.4 × 10⁴ g × 10% = 6.4 × 10³ g

N: 6.4 × 10⁴ g × 3.0% = 1.9 × 10³ g

Ca: 6.4 × 10⁴ g × 1.6% = 1.0 × 10³ g

P: 6.4 × 10⁴ g × 1.2% = 7.7 × 10² g

Other elements: 6.4 × 10⁴ g × 1.2% = 7.7 × 10² g

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