Răspuns:
Explicație:
H2O
== r.a. = 2H : 1O = 2 : 1
== r.m.= 2AH : AO
=2 . 1 : 16
=2 : 16 se simplifica cu 2
= 1 : 8
== MH2O= 2+16=18----------> 18g/moli
== Comp. proc. prin masa moleculara
M=18-------> 18g/moli
18g H2O------------2g H------------16g O
100gH2O----------------x-----------------y
x=100.2 : 18=11,11% H
y= 100.16 : 18=88,88% O
