Question

there are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass. why is this statement true? hydrogen is a gas, but oxygen is a solid. hydrogen atoms have a lower mass than oxygen atoms. hydrogen atoms make up more of waters mass than oxygen atoms. hydrogen is present as single atoms and oxygen is bonded in compounds.

Explanation:

Hydrogen has an atomic mass of approximately \(1\space u\), while oxygen has an atomic mass of approximately \(16\space u\). So, even though there are more hydrogen atoms in living organisms, because of the much lower mass of hydrogen atoms compared to oxygen atoms, oxygen is more abundant in terms of mass.

Answer:

B. Hydrogen atoms have a lower mass than oxygen atoms.