Na+H2O=NaOH+1/2H2
23 18 40 1
m1 0.6
Na2O+H2O=2NaOH
62 18 80
m2
m1+m2=16.9
水过量:m1=13.8g,m2=3.1g
钠过量:m1>63.9g(舍去).