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CORONITA!!

O alchena A aditioneaza acid bromhidirc, conducand la un compus B care contine 48,48% Br. Determinati formula moleculara a alchenei A.


Răspuns :

CnH2n+HBr=CnH2n+1Brcalculam masa moleculara pt compusul bromurat= 14n+81 folosim regula 14n+81.......80g Br si. 100...............48,48g Br si n= 6