Compound, A substance made up of two or more types of atoms chemically bonded together., Avogadro's constant, The number of atoms, molecules or ions in a mole of a given substance, 6.02 x 1023., Empirical Formula, The simples whole number ratio of atoms of each element in a compound., Limiting Reagent, The reactant that is completely used up since it limits the amount of products formed., Molar Volume at RTP, 24dm3, Relative atomic mass, The average mass of an element, as the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of carbon-12, Mole, the unit for amount of substance. The symbol for the unit mole is mol., Molecular Formula, The actual ratio of atoms of each element present in a compound., Percentage purity, the percentage ratio of mass of a pure compound in an impure sample, Percentage yield, the percentage ratio of the actual yield of product from a reaction compared with the theoretical yield.

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