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Mole

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Unit of measurement for the amount of a substance. Used for measuring LARGE amounts of really TINY things.

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Avagadro's Number

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The number of particles in exactly one mole of a pure substance.

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Molar Mass

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The mass of one mole of a pure substance.

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Conversion Factor

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A ratio of equivalent values.

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Formula Mass

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The sum of the average atomic masses of a compound's elements.

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Percent Composition

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Percentage (based on mass) of each element in a compound.

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Empirical Formula

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Symbols of elements and subscripts written to represent the lowest whole-number mole ratio of atoms in a compound.

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Molecular Formula

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The actual formula for the compound, which is not always reduced to the lowest whole number ratio.