Question

A mole 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

Answer 1

B) Carbon-12

Step-by-step 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)

Answer 2

To determine the element, we must take reference to the periodic table to confirm each element and its equivalent atomic weight. The given is 12 grams of the isotope per mole of it. Hence, we must find out the element in the periodic table which has an atomic weight of 12. The element is carbon, hence answer is B.