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Mole represents Avogadro’s number (6.02 x 10^23) Mole is a unit of measurement Symbol is mol No. of particles = no. of moles x Avogadro’s number = n x 6.02 x 10^23 The mole makes chemical calculations possible Chemicals react in groups of moles The chemical equation shows ratio of moles reacting Molar mass (MR) is mass of 1 mol MR is also atomic mass number (based on C=12) n = m/MR m is mass (g) MR of molecule is sum of MR For gases: PV = nRT (pressure x volume = n n applies to all states for liquids: n = CV, C is concentration (mol/L),