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miedz-Cu <I>
siarczek miedzi- Cu2S
S-x gram
Cu-64g.
Cu2S=80g.
S+Cu=Cu2S
x+64=80g /-64
x=16g
Odp. Przereagowało 16g siarki.
Ms=32
Mcu=64
Mcu2s=160
160Cu2S - 32S
80 - x
x=16