What is a mole? A mole of a substance is the amount of that substance which contains 6 x 10 23 particles of that substance.
Relative molecular mass The relative molecular mass of a compound is the mass of one molecule of the compound compared to 1/12 th of the mass of the carbon-12 isotope.
Molar Mass The molar mass of a substance is the mass in grams of one mole of the substance. The molar mass has the same numerical value as its relative molecular mass, but its units are grams (g). 1 mol of carbon, 12 g