Atoms, Molecules and Stoichiometry

What is the Definition of Empirical Formula?

The empirical formula of a compound shows the simplest whole-number ratio of the elements present.

What is the relative atomic mass?

What is the relative molecular mass?

The Ar, of an element is the average mass of the naturally occurring isotopes of the element relative to the mass of an atom of carbon-12. The Mr, is the mass of a molecule relative to the mass of a molecule relative to the mass of an atom of carbon-12, which is given the exact mass of 12.

What is a mole?

A mole of substance is the amount of substance that has the same number of particles as there are in 12.00g of carbon-12. The particles may be atoms, molecules, ions or even electrons.

This number of particles is a constant known as Avagadros constant (L), and is approximately 6 x 10²³mol^-1.