d=ms/Vs => ms=d*Vs=0,8*220=176g solutie etanol 96%
96/100=md/176 => md=176*96/100=168,96 g etanol
46g.......................22,4l
CH3-CH2-OH -> CH2=CH2 + H2O
168,96g...............x=?
x=168,96*22,4/46=82,2762l etena
randament/100=Vpractic/Vteoretic => randament=66*100/82,2762=80,21%