Answer:
Na2SO4 means: two moles sodium (45.98 g), one mole sulfur (32.06 g), and four moles oxygen (64.00 g) combine to form one mole of sodium sulfate (142.04 g).
Explanation:
As we can see in the formulae, Na₂SO₄
We can see that 4 is the subscript of O and that means There are 4 atoms of oxygen.
