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C₂H₅OH + 2O₂ ----> 2CO + 3H₂O
mC₂H₅OH = 2*12u + 6* 1u + 16u = 24u + 6u + 16u = 46u
m 2CO = 2 * 12u + 2 * 16u = 56u
układamy proporcję
46u C₂H₅OH ------------------------ 56u CO
X -------------------------- 84g
x = 46u * 84g / 56u = 69g
Potrzeba 69g C₂H₅OH