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4+1=5
masa tlenu - 15g*1/5=3g
masa Cu - 15g * 4/5 = 12g
2at + 1cz. 2at --> 2 cz.
Cu : O = 4 : 1
m O = 1/5 m CuO
15g*1/5=15g/3=3g -masa tlenu
m Cu = 4/5 CuO
15g * 4/5 = 3*4g=12g lub 15g-3g=12g -masa miedzi