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Unit 6

The Mole

TermDefinition
Avogadro´s number 6.022 141 79 x 10^23 - is the number of particles in exactly one mole of a pure substance
molar mass The mass of one mole of a pure substance is called the molar mass of that substance.
mole A mole (abbreviated mol) is the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon - 12.
molecule A molecule is a neutral group of atoms that are held together by covalent bonds
Scientific notation In science notation, numbers are written in the form M x 10^n, where the factor M is a number greater than or equal to 1 but less than 10, and n is a whole number.
formula unit A formula unit is the simplest collection of atoms from which an ionic compound ´s formula can be written.
molecular mass The molar mass of a compound is calculated by adding the masses of the elements present in a mole of the molecules or formula units that make up the compound.
atomic mass Average atomic mass is the weighted average of the atomic masses of the naturally occuring isotopes of an element.
molecular formula A molecular formula shows the types and numbers of atoms combined in a single formula of a molecular compound.
density Density is the ratio of mass to volume, or mass divided by volume.
Formula mass Formula mass of any molecule, formula unit , or ion is the sum of the average atomic masses of all atoms represented in it´s formula.
Percent composition The percentage by mass of each element in a compound is known as the percentage composition of the compound.
Empirical formula An empirical formula consists of the symbols for the elements combined in a compound, with subscripts showing the smallest whole-number mole ratio of the different atoms in the compound.
Created by: ev339777
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