1) The weighted average mass must be used to allow for the presence of isotopes, using their percentage abundance in calculations.
2) The word ‘entity’ is just a general word for a particle. It can refer to an atom, molecule, ion, or even an electron. It also refers to the simplest formula unit of a giant ionic structure.
3) We use the term ‘molar mass’ which is the mass per mole of substance. It has the units: kg mol^-3 or g mol^-3. The molar mass in g mol^-3 is the same numerically as Mr.
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