2Na2O2+2H2O=4NaOH+O2①
2Na2O2+CO2=2Na2CO3+O2②
设①中生成O2Xml ②中生成O2Yml 原来N2Zml(X+Y+Z):(2X+2Y+Z)=3:4
求出Z=50ml体积分数为50%