Define a term "a mole
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answer : 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.
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A mole is defined as 6.02214076 × 10²³ of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
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