Осуществите превращение Na-Na2o-NaOH-Na2so4
2Na+O2 = 2Na2O Na2O+H2O = 2NaOH 2NaOH+H2SO4 = Na2SO4+2H2O
4Na+O2->2Na2O Na2O+H2O->2NaOH 2NaOH+H2SO4->Na2SO4+2H2O