What is the mass of 1.50 mol of sodium, na?

To get the answer, you must know first the formula:

We know that moles = mass divided by molecular weight

So to get the mass, we need to alter the original formula, so

mass of sodium = 1.5 moles x atomic weight of Na

so what is the atomic weight of Sodium? It is 22.989769 u.

so the mass of sodium = 1.5 moles x 22.989769 u = 34.4846535