Which statement is correct?
1 )
The relative atomic mass of a ${}^{35}Cl{\text{ }}$ atom is 35.5.
The relative formula mass of $CaC{O_3}$ is 100.1.
3 )
The relative isotopic mass of a ${}^{24}Mg$ atom is 24.3.
4 )
The relative molecular mass of ${O_2}$ is 16.0.
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