-deduc msele de CO2 si H2O care s-ar obtine din 104g compus(M)
3,12g....................6,6gCO2...............3,24g H2O
104....................m= 220g....................m= 108g
-moliCO2=moliC ........ M,CO2= 44g/mol
n(niu)= 220g/44g/mol= 5mol CO2=> 5molC
-moliH=2molH2O....... M,H2O= 18g/mol
n= 108g/18g/mol= 6mol H2O---> 12molH
COMPUSUL ar fi C5H12, dar ar avea masa molara M= 72g----> pana la 104g mai sunt 32g, ceea ce corespunde la 2 molO
C5H12O2