The Mole & Stoichiometry & Chemical Equations

Chapter 6 & 7

Empirical formula

what elements are present in the compound, and the simplest whole number ratio of the atom.

Molecular formula

the actual number of atoms of each element present in a molecule of the compound

Mole

is the amount of that substance that contains as many particles as there are atoms of ¹²C in 12g of of ¹²C. One mole amounts to the contains 6 × 10²³ particles of that substance is called Avogadro’s constant.

Relative molecular mass

the average mass of one molecule of that compound compared with 1/12 of the mass of an atom of the C12 isotope. 

Molar mass

the mass of one mole of a substance. The molar mass of a substance is the relative molecular mass expressed in g/mol 

Molar volume

the volume occupied by any gas. It has been measure at standard temperature and pressure (stp) and found to be 22.4L. 

Law of Conservation of Mass

the total mass of the products of a chemical reaction is the same as the total mass of the reactants

Law of Conservation of Matter

any chemical reaction, matter is neither created nor destroyed but merely changes from one form to another