Which of the following statements about atoms and molecules is correct?
- AThe molecular formula of a compound is the simplest whole number ratio of atoms of each element in the compound.
- BOne mole of any substance contains $6 \times 10^{23}$ atoms.
- CThe relative atomic mass of an element is the ratio of the average mass of one atom of the element to the mass of an atom of carbon-12.
- DThe relative formula mass of a compound is the sum of the individual atomic masses of all the atoms in the formula.