Question

140 g alchena aditioneaza complet 4,627 clor masurat la 15 atm si 150 C . Care este alchena ??

Answer 1

 (12*n+2*n) g       71 g
CnH2n        +      Cl2 = CnH2nCl2
140 g                   x

x = 140*71/14n = 710/n g Cl2
Daca avem:
V = 4,627 l Cl2
p = 15 atm
T = 150+273 = 423 K

p*V = m*R*T / M
m Cl2 = p*V*M / R*T = 15*4,627*71 / 0,082*423 = 142,067 g Cl2

710/n = 142,067
n = 710/142,067 = 4,99 = 5

CnH2n = C5H10, adica pentena