Răspuns:
1. Cl2O; Cl2O3; Cl2O5; Cl2O7; ZnO; P2O3; P2O5; CO; CO2
2. r.a. P:O=4:6|:2=2:3
3. r.m. Ca:S:O4=40:32:64|:8=5:4:8
4.51,61%Cu
9,68%C
38,71%O
Cu:51,61/64=0,806 at.-gr.
C:9,68/12=0,806 at.-gr.
O:38,71/16=2,419 at.-gr.
:0,806
Cu:0,806/0,806=1 at. Cu
C:0,806/0,806=1 at. C
O:2,419/0,806=3 at. O
=>CuCO3