Define relative atomic mass.

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Solution

Definition of relative atomic mass:
The ratio of the average mass of one atom of an element to the ${(1 / 12)}^{th}$ of the mass of a carbon $- 12$ isotope.
It is a unitless quantity.
Thus, relative atomic mass $=$ [Average mass of one atom of an element] $/$ [( $1 / 12$ ) $\times$ Mass of carbon $- 12$ isotope]

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