Chemistry Concepts: Stoichiometry

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Avogadro's number

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Balanced equation

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Cancel

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To cross out, remove, delete, or invalidate something. In algebra, identical terms in the numerator and denominator can be cancelled.

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Coefficient

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A number that multiplies a term in an equation. In chemical equations, it indicates the number of each type of molecule.

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Conversion factor

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Dimensional analysis

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A technique in which comparison of units on both sides of an equation is used to solve problems.

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Formula mass

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The mass of one unit of a compound, measured in unified mass units (u). Example: NaCl = 58.44 u.

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Diagram showing the cancellation of units in a conversion example.

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Molar mass

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The mass of one mole of a substance. The molar mass in grams per mole is equal to the formula mass in unified mass units.

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Example of molar mass

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The formula mass of oxygen (O₂) is 32 unified mass units (32 u). The molar mass of oxygen gas is 32 grams per mole, or 32 g/mol.