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2Cu + O₂ →2CuO
CuO + 2HCl →CuCl₂ + H₂O
CuCl₂ + KOH→ Cu(OH)₂ + 2KCl
2. . Wzór tlenku EO₂
E + 2*16u --------------100%
2*16u---------------------72,7%
2*16*100 =(E+32)*72,7
44= E + 32
E = 44-32 =12u – to węgiel
Tlenek CO₂