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# Quantitative Compo

TermDefinition
Avogado’s Number The number of formula units in one mole. 6.022 X 10²³
Empirical formula The chemical formula that gives the smallest whole-number ratio of atoms in a compound – that is, the relative number of atoms of each element in the compound; also known as the simplest formula.
Molar mass The mass of Avogadro’s number of atoms or molecules. The sum of the atomic masses of all the atoms in an element, compound, or ion. The mass of a mole of any formula unit. It is also known as the molecular weight.
Mole The amount of a substance containing the same number of formula units (6.022 X 10²³) as there are in exactly 12 g of ¹²C. One of these is equal to the molar mass in grams of any substance.
Molecular formula The total number of atoms of each element present in one molecule of a compound; also known as the true formula.
Percent composition of a compound The mass percent represented by each element in a compound. 1) Calculate the molar mass. 2) Divide the total mass of each element in the formula by the molar mass and multiply by 100.
¹²C The reference isotope for atomic masses.
Created by: NicholeBarber