Amount of Substances

Question 1

relative atomic mass

Answer 1

the weighted average mass of all the isotopes of an element relative to 1/12 the mass of one atom of carbon-12

Question 2

relative formula mass

Answer 2

the mean mass of a molecule relative to 1/12 the mass of one atom of carbon-12

Question 3

empirical formula

Answer 3

simplest whole number ratio of atoms of each element in a compound