Question

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what is a mole?
a mole is an amount of substance containing the same number of
as there are atoms in exactly
g of carbon - 12.
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Explanation:

A mole is a fundamental unit in chemistry. By definition, it is the amount of a substance that contains the same number of entities (such as atoms, molecules, ions, etc.) as there are atoms in exactly 12 grams of carbon - 12. This is a key concept in stoichiometry and chemical calculations.

Answer:

entities; 12