mfinala=minitiala+1,6=16,4+1,6=18g
netan=m etan/M etan=18/30=0,6moli
consideram raportul initial acetilena:etan=x:y
26g...................1mol
C2H2 + 2H2 -> C2H6
26x....................x moli
30g........1mol
C2H6 -> C2H6
30y.........y
26x+30y=16,4 (I)
x+y=0,6 (II)
(II) -> (I): 26(x+y)+4y=16,4
4y=16,4-26*0,6=0,8
y=0,2 => x=0,6-0,2=0,4
x:y=0,4/0,2=2:1=2