what is an mole?
explain mole concept?
Dear Student!
One mole of a substance (atoms, molecules, ions, or particles) is that quantity in number having a mass equal to its atomic or molecular mass in grams. One mole of any substance contains 6.022 × 1023 particles (atoms, molecules, or ions). This means that one mole atom of any substance contains 6.022 ×1023 atoms. Similarly, one mole molecule of any substance contains 6.022 ×1023 molecules, and one mole ion of any substance contains 6.022 ×1023 ions. Hence, the mass of a particular substance is fixed.
The number 6.022 × 1023 is an experimentally obtained value and is known as Avogadro’s number or Avogadro constant (represented by No). It is named after the Italian scientist, Amedeo Avogadro.
Thus, 1 mole of oxygen atoms (O) = 6.022 ×1023 oxygen atoms.
1 mole of oxygen molecules (O2) = 6.022 × 1023 oxygen molecules.
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