A mole is a unit of measurement in chemistry. It represents 6.022 x 10^23 particles (atoms, molecules, ions etc.) of a substance.
This is the number of particles in one mole of a substance, approximately 6.022 x 10^23.
This is the mass (in grams) of one mole of a substance.
This is the volume occupied by one mole of any gas at standard temperature and pressure (STP).