1.
md = 52 g , m.apa = 500 g
stim ca c%= mdx100/ms
si ca ms = md+m.apa
=> ms = 52+500 = 552 g sol
=> c = 52x100/552 = 9,42%
2.
2Cu + O2 => 2CuO
CuO + H2SO4 => CuSO4 + H2O
CuSO4 + 2NaOH => Cu(OH)2 + Na2SO4
Cu(OH)2 + 2HCl => CuCl2 + H2O
CuCl2(solutie) --electroliza--> Cu + Cl2
