nNa2O = 0.4 mol
Na2O + H2O --> 2NaOH
0.4_____________0.8
CM NaOH = 0.8/ 2 = 0.4M
2NaOH + CO2 --> Na2CO3 + H2O
0.8_______0.4
VCO2 = 0.4*22.4 = 8.96 l
2NaOH + H2SO4 --> Na2SO4 + H2O
0.8_______0.4
mH2SO4 = 39.2 g
mddH2SO4 = 400 g
VddH2SO4 = 363.63 ml