MCxHy=2,49*28,9=72g/mol
n=m/M=7,2/72=0,1 moli CxHy
44g CO2.................12g C
22g CO2.................x=6g C
mH2O=7,2-6=1,2g H2
n=m/M=6/12=0,5 moli C
n=m/M=1,2/2=0,6 moli H2
0,1 moli CxHy............0,5 moli C..........0,6 moli H2
1 mol CxHy................x=5 atomi C.....y=12 atomi H
F.M => C5H12 - n-pentan