Atoms, Molecules and Stoichiometry

Flash Cards to with calculations for Chemistry AS

HideShow resource information


What is the Definition of Empirical Formula?

1 of 6

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

2 of 6

What is the relative atomic mass?

What is the relative molecular mass?

3 of 6

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.

4 of 6

What is a mole?

5 of 6

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.

6 of 6




Brilliant resorces :)



Good information displayed clearly - a bit more content would be really helpful.



I agree with ^^

Similar Chemistry resources:

See all Chemistry resources »See all Calculations resources »