what is Avagadro's number?
Avagadro's number is the number of objects in one mole of that thing
Na = 6.022*1023
A mole of hydrogen atoms contains 6.022*1023 atoms, a mole of sugar molecules contains 6.022*1023 molecules, a mole of StarWars figures has 6.022*1023 figures. While the latter might seem to be appoximately the number of Phantom Menace toys sold in the first week of availability, a real mole of toys would take up something on the order of 1% of the volume of the Earth. A mole is a very large number.