Which one of the following statements is correct?
- AThe relative atomic mass of a $^{35}\mathrm{Cl}$ atom is 35.5.
- BThe relative molecular mass of $\mathrm{O_2}$ is 16.0.
- CThe relative formula mass of $\mathrm{CaCO_3}$ is 100.1.
- DThe relative isotopic mass of a $^{24}\mathrm{Mg}$ atom is 24.3.