Transformam volumul in moli:
n=V/Vm=2,24/22,4=0,1moli CO2
f.gen alcan: CnH2n+2
Malcan=14n+2 g/mol
14n+2...................................n moli
CnH2n+2 + (3n+1)/2 O2 -> nCO2 + (n+1)H2O
1,45g....................................0,1moli
14n+2=1,45n/0,1=14,5n
0,5n=2 => n=4
f.m: C4H10