Relative formula mass - What does the relative formula mass compare the mass of?
a formula unit with the mass of an atom of carbon-12
Relative formula mass - How is the relative formula mass calculated?
by adding together the relative atomic masses of the elements in the empirical formula
Finding formulae by experiment - How can you predict the formula of an ionic compound?
from its ions
Finding formulae by experiment - If you do not know which ions are in a compound, how can the formula be worked out?
from the results of experiments
Finding formulae by experiment - What is analysis?
investigating the chemical composition of a substance