Question

The elemental composition of an adult human body by mass is
A) C > O > H > N B) O >C >H > O C) N > C > O > H D) None

Answer 1

Answer:

here is your amswer

Explanation:

Element Symbol percent mass percent atoms

Oxygen O 65.0 24.0

Carbon C 18.5 12.0

Hydrogen H 9.5 62.0

Nitrogen N 3.2 1.1

Calcium Ca 1.5 0.22

Phosphorus P 1.0 0.22

Potassium K 0.4 0.03

Sulfur S 0.3 0.038

Sodium Na 0.2 0.037

Chlorine Cl 0.2 0.024

Magnesium Mg 0.1 0.015

All others < 1.0 < 0.3

so your answer is (B) O>C>H

hope answer is right and helpful