Răspuns:
Explicație:
Ca(OH)2
a. r.a.= 1 : 2 : 2
e. r.m.= 40 : 2.16 : 2
= 40 : 32 : 2
= 20 : 16 : 1
b. M= 40 + 32 + 2=74-------> 74g/mol
c. comp. proc. prin masa moleculara
74 g Ca(OH)2---------40g Ca ------32g O--------2g H
100 g---------------------------x--------------y----------------z
x= 100 . 40 : 74=54,05% Ca
y=100. 32 : 74=43,24 % O
z= 100 .2 : 74= 2,71% H
e. n= m: M
m= n . M
m= 10 moli . 74g/moli= 740 g Ca(OH)2
f.
74g Ca(OH)2 ----------32g O
148g-------------------------x
x= 148 . 32 : 74=64g O