Question

why was oxygen replaced by carbon to find the atomic mass of elements...?​​

Answer 1

Answer:

Explanation:

This was because the scientist did get the molecular mass in whole no. and it made calculations diff. so carbon-12 atom was taken as refrence atom. Earlier Oxygen was used as the reference for mass measurements. Then the O17, O18 isotopes of Oxygen were also discovered being present in the natural air/oxygen.

Answer 2

Answer:

mass scale has changed from erstwhile,due to various

isoptope of baseline.Strangely,

identical atomic weights based on natural mix of Oxygen

Explanation:

isotopes of baseline in the sense,

Stable carbon isotopes of dissolved