pentru
CuSO4
raportul atomic=1:1:4
raportul de masa=64:32:64=2:1:2
compozitia procentuala de masa:
ω(Cu)=64g*100%/160g=40%
ω(S)=32g*100%/160g=20%
ω(O)=64g*100%/160g=40%
pentru
Al(OH)3
raportul atomic=1:3:3
raportul de masa=27:48:3=9:16:1
compozitia procentuala de masa
ω(Al)=27g*100%/78g=34,6%
ω(O)=48g*100%/78g=61,5%
ω(H)=3g*100%/78g=3,8%