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stoichiometry

that portion of chemistry dealing with numerical relationships in chemical reactions; the calculation of quantities of substances involved in chemical equations

mole

the unit used to count number of atoms, molecules, or formula units of substances

avogadro constant

the number of things in one mole of a substance; 6.02 x 10^23

molar mass

the mass of one mole of a pure substance

molecular mass

the mass in atomic mass units of one molecule of a covalent compound

formula mass

the mass in atomic mass units of one formula unit of an ionic compound

molar volume

the volume that a mole of gas occupies at a pressure of one atmosphere and a temperature of 0 degress C

ideal gas law

the equation that expresses exactly how pressure P,volume V, temperature T and the number of particles n of a gas are related; PV= nRT

empirical formula

the formula of a compound having the smallest whole number ratio of atoms in the compound