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O alchina (A) contine in molecula 88,23%C in procente de masa. Determinati formula moleculara a alchinei.

Răspuns :

Axentediana
100-88,23=11,27 % H
nr atom/gC=7,35     |
nr atom /g H=11,77 | 7,35==> (CH1,6)n
M(CH1,6)n=13,6n
MCnH2n-2=14n-2
14n-2=13,6n
0,4n=2 
n=5
C5H8-pentina