Question

Na ⇒NaOH⇒Na₂SO₄⇒BaSO₄⇒ВаО⇒Ba(OH)₂⇒Ba(NO₃)₂

Answer 1

2Na + 2H2O = 2NaOH + H2

2NaOH + H2SO4 = Na2SO4 + 2H2O

Na2SO4 + BaCl2 = BaSO4 + 2NaCl

BaSO4  -> BaO + SO3

BaO + H2O = Ba(OH)2

Ba(OH)2 + 2HNO3 = Ba(NO3)2 + 2H2O