Question

what does a mole represent?
a. the number of protons in a nucleus
b. the mass of one atom of an element
c. a very large, specific number of items
d. the concentration of a dissolved substance

Explanation:

A mole is a unit in chemistry representing Avogadro's number ($6.022\times 10^{23}$) of entities (such as atoms, molecules, etc.), which is a very large, specific number.

Answer:

C. A very large, specific number of items