calculez masa C si H din 58g compus
100g compus.........82,75gC.........17,25gH
58g.....................m= 48g...................m=10g
calculez moli C, H din masele obtinute, stiind M,C= 12g/mol M,H=1g/mol
niu,C= m/M= 48g/12g/mol= 4molC
niu =m/M= 10g/1g/mol= 10molH
F.MOLECULARA este C4H8