Chemistry Concepts: Mole

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Atomic mass

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The mass of an atom, expressed in unified atomic mass units (u).

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Avogadro constant

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Conversion factor

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A ratio or fraction numerically equal to one, used to convert quantities from one unit to another.

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Dimensional analysis

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A technique used to change the units of a quantity without changing its value, also known as the factor-label method.

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Formula mass

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The sum of the atomic masses of the atoms in one formula unit of a compound, measured in unified atomic mass units (u).

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Formula unit

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The smallest possible amount of a chemical compound, known as a molecule if held together with covalent bonds.

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Molar mass

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The mass of one mole of a substance, measured in grams per mole (g/mol), numerically equal to its atomic or molecular mass in unified atomic mass units.

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Mole

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Scientific Notation

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Significant Figures

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Digits in a value that indicate the accuracy of a measurement. A measurement should be recorded with a number of significant figures that reflects the resolution of the instrument. For example, 345 has three significant digits.