Răspuns:
1. a)
MC4H8=4×12+8×1=56g/mol
in 56(Masa molara)g C4H8..... 48g C.......8g H
in 100 g C4H8............ ......................x..................y
x=48×100/56=85,71 % C
y=8×100/56=14,28%H
b)
C=82,75/12=6,89
H=17,25%/1=17,25
îîmpărțim rezultatelela 6,89
C=6,88/6,89=1
H=17,25/6,89=2,50
M(CH2,5)n=58=(12+2,5)n=14,5
n=58/14,5=4
formula moleculara C4H10
succes