QA

Question 1

Relative molecular mass

Answer 1

The relative molecular mass(mr) of a molecular substance is the average mass of one molecule of that substance relative to 1/12 the mass of a carbon 12 atom

Question 2

Relative formula mass

Answer 2

The relative formula mass (mr) of an ionic compound is the average mass of 1 unit of that compound relative to 1/12 of the mass of a carbon-12 atom.

Question 3

Relative atomic mass

Answer 3

The relative atomic mass of an element is the average mass of one atom of that element relative to 1/12 the mass of a carbon-12 atom