12 terms

Chem: Chapter 4 - mole concepts

Chapter 4 - moles
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Mole (abbreviated Mol)
The SI unit used to measure the amount of a substance. Is equal to 6.02 X 10²³ particles of any substance.
Avogadro's number
number of "representative particles" in a mole, 6.02 X 10²³
representative particles
Refers to the type of particle present in a substance: usually atoms, molecules, or formula units.
molecule
two or more atoms held together by covalent bonds
formula unit
The lowest whole-number ratio of ions in an ionic compound
molar mass
the mass in grams of 1 mol of a substance
gram atomic mass
the mass of one mole of an element, found as the "atomic mass" on the periodic table, expressed as grams per mole (g/mol)
gram formula mass
the sum of the mass of all the atoms in one mole of an ionic compound, expressed as grams per mole (g/mol)
gram molecular mass
The sum of the mass of all the atoms in one mole of a particular molecule, expressed as grams per mole (g/mol)
empirical formula
a formula showing the lowest whole number ratio of atoms in a compound
percent composition
the percent by mass of each element in a compound
"Molar Express"
tool used for setting up Chemistry problems