C = md/ms×100= > md = C×ms/100 = 5×146/100 = 7,3g HCl
MO+ 2HCl => MCl2 + H2O
M+16g..........2×36,5g HCl
7,95g...................7,3g
7,3M +116,8 = 580,35 => M = 63,5 , aproximativ M = 64g/mol , Cu
CuO + 2HCl = > CuCl2 + H2O
Substanta izolata in solutie => CuCl2