What is the standard atom?
The atom of the carbon-12 isotope
What is the ‘mass’ of the standard atom?
Exactly 12
What is the relative atomic mass?
The average mass of the atoms of the element, using a scale where an atom of carbon-12 has a mass of exactly 12.
what is the relative formula mass?
The sum of the relative atomic masses of the elements present in a formula unit.

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