Question

what is a mole of substance ?​

Answer 1

One mole is defined as the amount of substance containing as many elementary entities as there are atoms in 12 grams of carbon-12 .

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Answer 2

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. Also spelled as mol.