define 1mole of an atom
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One mole is defined as the amount of substance containing as many elementary entities (atoms, molecules, ions, electrons, radicals, etc.) as there are atoms in 12 grams of carbon-12 (6.023 x 1023). The mass of one mole of a substance equals its relative molecular mass expressed in grams.
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Explanation:
A mole corresponds to the mass of a substance that contains 6.023 x 1023 particles of the substance.
The mole is the SI unit for the amount of a substance. Its symbol is mol.
By definition: 1 mol of carbon-12 has a mass of 12 grams and contains 6.022140857 x 1023 of carbon atoms (to 10 significant figures).
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