What are the proportions by mass of the elements in the compound Sodium Sulfate, Na2SO4?

Question

So far I have Sodium 23(2)
Sulfur 32(1)
Oxygen 16(4)
but not sure if that helps need to find

Na____S____O____

Answer 1

Just add up the various molecular weights to get the total. But you need to remember that your compound has 2 atoms of Na and 4 atoms of Oxygen. So add accordingly. Then yu can calculate the percentages