If you are given only the amount, in moles, of an unidentified chemical quantity, you can calculate the number of:

representative particles in the sample << I choose this one am i right?

atoms in the sample

molecules in the sample

particles, atoms and molecules

The answer is: representative particles in the sample.

The Avogadro's number is the number of atoms in 12 grams of the isotope carbon-12 (¹²C).

Na is Avogadro number or Avogadro constant (the number of particles, in this example carbon, that are contained in the amount of substance given by one mole).

The Avogadro number has value 6.022·10²³ 1/mol in the International System of Units; Na = 6.022·10²³ 1/mol.