Răspuns:
Explicație:
MCa(OH)2= 40 + 2.16 +2=74--------> 74g/moli
n= 4,625g : 74g/moli=0,00625 moli Ca(OH)2
1mol Ca(OH)2------20 . 6,023.10²³ e
0,00625moli----------------x
x= 0,00625 . 20 .6,023.10²³ e =0,2075377 .10²³ e
