Sodium has an atomic mass of 23. There are _______ moles in 46g of sodium.

A mole is the amount of substance containing exactly $6.022 \times {10}^{23}$ elementary particles. The number of particles in a given substance can be expressed much more simply in terms of moles. As sodium has an atomic number as 23, the number of moles of sodium in 46g sodium is 2 moleS.