Question

Which of the following best defines one mole of a substance?

A. Mass, in grams, of each particle of the substance.
B. Mass, in grams, of the nuclear us of the substance’s atoms.
C. Amount of substance present in one atom of the substance
D. Amount of substance present in Avogadro‘s number of particles of the substance

Answer 1

Answer: D

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)

Answer 2

Moles are the base unit or the smallest chemical entities that are present in the molecule, atom, or compound.

The one mole of a substance is equal to the amount of substance present in the Avogadro's number of particles of the substance.

Moles can be defined as:

• Moles are the exactly $6.02214\times 10^{23}$ elementary entities present in the atoms, molecules, ions, or an electron.  

• The value of given by the scientist Amedeo Avogadro, who is noted for the discovery of Avogadro's law and Avogadro's constant.

Thus, the correct answer is Option D.

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