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A mole is the standard scientific unit used to measure the amount of a substance, defined by how many atoms or molecules it contains. It matters because it allows scientists and engineers to work with consistent measurements when dealing with chemical reactions and material properties.
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The mole (symbol mol) is a unit of measurement, the base unit in the International System of Units (SI) for amount of substance. One mole is an aggregate of exactly 6.02214076×10 elementary entities which can be atoms, molecules, ions, ion pairs, or other particles. This number of entities equals 602,214,076,000,000,000,000,000, approximately 602 sextillion or 602 billion multiplied by one trillion. The number of particles in a mole is the Avogadro number (symbol N0) and the numerical value of the Avogadro constant (symbol NA) has units of mol. The relationship between the mole, Avogadro number, and Avogadro constant can be expressed in the following equation:
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