Răspuns:
Explicație:
-se afla masa pura de Na2O [p=puritate ]
p=mp.100 : mi
mp=p .mi : 100
mp=94 . 600 : 100=564 g Na2O pur
564g xg
Na2O + H2O=2NaOH
62g 2.40g
x=564 .80 : 62=727,74 gNaOH
-se afla nr. moli NaOH
n=m:M
n=727,74g : 40g/moli=18,19 moli NaOH
MNaOH= 23+ 16 +1=40------->40g/moli
MNa2O=2.23 + 16=62-------> 62g/moli