2.1 relative atomic and molecular masses

• The relative atomic mass is the weighted average mass of an atom of an element, taking into account its naturally occurring isotopes, relative to 1/12 the relative atomic mass of an atom of carbon-12
• the relative molecular mass of a molecule is the mass of that molecule compared to 1/12 the relative atomic mass of an atom of carbon-12
• you find the relative molecular mass by adding up the relative atomic masses of all the atoms present in the molecule
• the avogadro constant is the number of atoms in 12g of carbon-12
• the amount of substance that contains 6.022x10-23 particles is called a mole
• the relative atomic mass of any element in grams contains one mole of atoms
• number of moles = mass / mass of 1 mole