Question

A compound is 58.39% by mass of oxygen what does this sentence mean?

Answer 1

It means the percentage of oxygen constituents in the chemical compound given..

Explanation:

In a chemical compound it is formed by different elements chemically joined together, each of those elements have it's percentage of constituents in the chemical compound by the amount of mass of that element..

Since oxygen has `58.39%` by mass in the compound, it means oxygen is abundantly present in the chemical compound since it's more that the `50%` mark..

It's just the amount of oxygen contained in a chemical compound, like for example, Sand comprises of silicon and oxygen, it's just the constituents of the compound `SiO_2`