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Care este alchena cu masa 42 care prin aditie de clor formeaza un compus dihalogenat saturat avand ? procent clor

Răspuns :

Formula moleculara: CnH2n
Malchenei=12n+2n=14n
14n=42 => n=3
C3H6 + Cl2 -> C3H6Cl2
Mprodusdiclorurat=Malchena+MCl2=42+35,5*2=42+71=113g/mol
113g...................100%
71g.........................x%
x=71*100/113=62,83%Cl