Taking into account the definition of avogadro's number, 3 moles of Na₂SO₄ are 1.8069×10²⁴ atoms of Na₂SO₄.
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
In this case you have 3 moles of the compound Na₂SO₄. Then you can apply the following rule of three: if 1 mole of the compound contains 6.023×10²³ atoms, then 3 moles of the compound contain how many atoms of copper?
amount of atoms of copper= (6.023×10²³ atoms× 3 moles)÷ 1 mole
amount of atoms of copper= 1.8069×10²⁴ atoms
Finally, 3 moles of Na₂SO₄ are 1.8069×10²⁴ atoms of Na₂SO₄.
Learn more about Avogadro's Number:
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