Question

If one mole of Na contains x atoms of sodium, what is the number of moles contained in 46g of sodium?

Answer 1

Actually the first part of the question is not related to the second part.

$x=6.022\times10^{23}$ by definition because one mole of anything contains $6.022\times10^{23}$ particles.

Atomic mass of Na is 23 (according to the periodic table), hence the number of moles in 46 g equals:

$n=46g(Na)\times\frac{1mol(Na)}{23g(Na)}=2mol$

Answer: 2