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Avogadro's number represents the number of units in a single mole of any substance (also referred to as the "molecular weight" of the substance). Keep in mind that the units may be electrons, atoms, ions, or molecules, depending on the substance and its reaction. Avogadro's number is 6.022140857 × 10^{23} [/tex].
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Explanation:

Avogadro's number/constant is named after an italian scientist; Amedeo Avogadro. Avogadro's number is the number of particles (atoms,ions or molecules) present in one mole of a substance. It is usually denoted as N or N₀.

Avogadro's number equals 6.02 ₓ 10²³

For instance, the number of particles present in 2 moles of sodium (Na) is

2 ₓ 6.02 ₓ 10²³.

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