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### 9 Cards in this Set

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 mole (mol) the SI base unit used to measure the amount of a substance - the number of representative particles, carbon atoms, in exactly 12 g of pure carbon-12 *6.02 X 10^23 representative particle any kind of particle - atoms - molecules - formula units - electrons - ions avogadro's number 6.02 X 10^23 molar mass the mass in grams of one mole of any pure substance unit: g/mol numerically equal to an elements atomic mass the masses of all elements are established as relative to the mass of carbon-12 i.e. 1 mole hydrogen-1 is 1/12 the mass of 1 mole carbon-12 subscripts in the chemical formula of a compound tell you the number of atoms of each element present in one molecule of the compound percent composition (mass of elemment / mass of compound) X 100 = percent by mass stoichiometry the study of quantitative relationships between amounts of reactants used and products formed by a chemical reaction based on the law of conservation of mass (mass of reactants = mass of products) mole ratio the ratio between the numbers of moles of any 2 substances in a balanced equation - determined using coefficients - each substance in a balanced chemical equation can be the numerator in a mole ratio with the remaining substances in the reaction moles of unknown = moles of known X (moles of unknown/moles of known) mole ratios are used as conversion factors to convert a known number of moles of one substance to moles of another substance in the same chemical reaction