C=8/12= 0,666 moli ||:0,666 => 1 atom C
H=1/1 = 1 mol H |||:0,666 => 1,5 atomi H
Formula bruta => (CH1,5)n
dgaz=M/Mgaz => M=dgaz*Mgaz=1,9285*28=54g/mol
Egalam cu formula bruta si inlocuim => (CH1,5)n=54 => 12n+1,5n=54=>13,5n=54=>n=4
Formula moleculara => C4H6 - 1-butina,2-butina