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2Cu₂O + C -----------> CO₂ + 4Cu
288u 44u
m2Cu₂O = 4 * 64u + 2 * 16u = 256u + 32u = 288u
mCO₂ 12u + 2 * 16u = 12u + 32u = 44u
układamy proporcję
72 tony --------------------- x
288u ------------------------ 44u
x = 72 tony * 44u / 288u = 11 ton
W reakcji powstanie 11 ton CO₂