Amole is the amount of a substance that contains as many particles as the number of atoms in 12 grams of what isotope?

a) boron-12
b) carbon-12
c) calcium-39
d) aluminum-26

B) Carbon-12

Explanation:

In chemistry, a 'mole' is a unit of measurement which reflects the amount or quantity of atoms, molecules, ions or other particles.

A mole is defined as the amount of substance containing as many particles as there are atoms in 12 grams of carbon. In general one mole of a substance is equal to its molar mass expressed in grams.

Therefore:

1 mole = molar mass (g) = 6.023*10²³ particles (Avogadro's number)

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