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(2*136u)(12u)
2 Cu₂O + C ---> 4 Cu + CO₂
72 g x
72g *12 u
x= _________ ≈ 3,2 g <-- masa wegla
2*136 u
2.
(32u) (88 u)
Fe +S ---> FeS
x 8,8 g
32 u *8,8 g
x=__________ = 3,2 g <-- masa siarki
88 u
m Fe = 8,8 g - 3,2 g= 5,6 g <--- masa zelaza