What's the mole number?
A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 1023).
The term "mole" to an amount containing Avogadro's number of whatever units are being considered.
Thus, it is possible to have a mole of atoms, ions, radicals, electrons, or quanta. The most common involves the measurement of mass.
25.000 grams of water will contain 25.000/18.015 moles of water, 25.000 grams of sodium will contain 25.000/22.990 moles of sodium.