Substances are given whose formulas are: Na₂O, SO₃, H₂O, CuO. Make equations of possible reactions between them.

Na₂O+SO₃=Na₂SO₄
Na₂O+H₂O=2NaOH
SO₃+H₂O=H₂SO₄

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.