Relative atomic mass and relative molecular mass and relative formula mass?

what are those?

Firstly, in chemistry, any mention of relative ------- mass immediately means based on the scale that one atom of Carbon-12 is defined as precisely 12 units of mass.

For naturally occuring elements, in their natural state, these values are tabulated in the ATOMIC WEIGHTS table of elements [alphabetical listing found under various similar names in General Chemistry text books]

So the table lists RELATIVE ATOMIC MASS
e.g. RAM of Oxygen is 15.9994

RELATIVE MOLECULAR MASS applies only to molecules of discrete structure. It is simply the sum of the relative atonic mass of each and every atom that makes up the molecule.
e.g. RMM of Oxygen is 31.9988 because the molecule is made up of two Oxygen atoms

RELATIVE FORMULA MASS applies to those pure compounds which do not exist as pure element or pure MOLECULAR compound.
e.g NaCl (common salt) is an infinite network lattice of sodium ions and chloride ions in the ratio of 1:1 so you treat RFM like RMM using the ratios of the atoms in the formaula "like they were the molecule" that they actually aren't.
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