H2C=CH2 + H2O __H+_> CH3-CH2-OH
CH3-CH2-OH + 3[O] _KMnO4/H+_> CH3-COOH + H2O
___________________________________________
V m3 .................................. 2 kg
H2C=CH2 .............. => CH3-COOH reactia este echivalenta
22,4 ................................... 60 kg/kmol
=> V = 22,4x2/60 = 0,747 m3 etena