What is the atomic mass of oxygen?

atomic mass. the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1/16 (0.0625) the mass of one oxygen atom, but after 1961 based on 1/12 (0.0833) the mass of the carbon-12 atom. read more

Quick Answer. The atomic mass of oxygen is 15.9994 atomic mass units. Oxygen has an atomic number of 8 and is classified as a non-metal. Its symbol is O. read more

The gram atomic mass is the mass of six times ten to the power of twenty three atoms. This number is called the Avogadro constant. The mass of a hydrogen atom is therefore one divided by the Avogadro constant. Oxygen has a gram atomic mass of 16, so the mass of a single oxygen atom is sixteen divided by the Avogadro constant. read more

Oxygen is the most abundant chemical element by mass in the Earth's biosphere, air, sea and land. Oxygen is the third most abundant chemical element in the universe, after hydrogen and helium. About 0.9% of the Sun's mass is oxygen. read more