甲乙丙丁中溶质的质量分数大小关系甲>乙=丙>丁
200mlH2O的质量=200ml*1g/ml=200g
Na2O----2Na
62 46
X 2.3g
X=3.1g
Na2O2----2Na
78 46
Y 2.3g
Y=3.9g
NaOH-----Na
40 23
Z 2.3g
Z=4g
2Na+2H2O=2NaOH+H2↑
46 80 2
2.3g X1 X2
X1=4g
X2=0.1g
甲中溶质的质量分数=4g/(2.3g+200g-0.1g)*100%=1.98%
Na2O+H2O=2NaOH
46 80
3.1g Y1
Y1=4g
乙中溶质的质量分数=4g/(3.1g+200g)*100%=1.97%
2Na2O2+2H2O=4NaOH+O2↑
156 160 32
3.9g Z1 Z2
Z1=4g
Z2=0.8g
丙中溶质的质量分数=4g/(3.9g+200g-0.8g)*100%=1.97%
丁中溶质的质量分数=4g/(4g+200g)*100%=1.96%
则甲乙丙丁中溶质的质量分数大小关系甲>乙=丙>丁