Relative isotopic mass
The mass of an atom of a particular isotope in relation to 1/12th the mass of an atom of carbon-12
Relative atomic mass
The weighted average masses of all the atoms in a normal isotopic sample of an element, relative to 1/12th the mass of on atom of carbon 12
Relative formula / Molecular mass
The average mass of a molecule or compound relative to 1/12th the mass of an atom of carbon-12
Molar volume
The volume occupied by one mole of any gas at constant temperature and pressure (the same for any gas)
Conditions for the ideal gas formula to work
Fast + random movement
No attraction or repulsion
Hardly any volume of molecules
No KE lost in collisions (elastic)
Moles definiton
The amount of substance that contains the same number of particles as there are atoms in 12g of carbon-12
