Formula units in 450 g of [tex]Na_{2} So_{4}[/tex] is 1.93 × 10²⁴ formula units.
Explanation:
First we have to find the number of moles in the given mass by dividing the mass by its molar mass as,
[tex]$\frac{450 g}{142.04 g/mol} = 3.2 moles[/tex]
Now, we have to multiply the number of moles of Na₂SO₄ by the Avogadro's number, 6.022 × 10²³ formula units/mol, so we will get the number of formula units present in the given mass of the compound.
3.2 mol × 6.022 × 10²³ = 1.93 × 10²⁴ formula units.
So, 1.93 × 10²⁴ formula units is present in 450g of Na₂SO₄.
