Question

Numarul de echivalenti-gram de dicromat de potasiu folositi pentru oxidarea in mediu acid a alchenei 2-metil-1-butena :
R: D.8 Eg
Va rog foarte mult sa-mi explicati totodata si genul acesta de problema cu Eg....nu-l stapanesc prea bine :( .
Multumesc anticipat !!!

Answer 1

Eg=Msubstanta/nr de electroni schimbati
MK2Cr2O7=78+52+164=294g
Egdicromat=294/6=49
pornim de la un mol de substanta
1mol.................................4moli
CH2=C(CH3)-CH2-CH3 + 4[O] -> CO2 + H2O + CH3-CO-CH2-CH3
1mol.................................4moli
294g.............................3moli
K2Cr2O7 + 4H2SO4 -> 3[O] + K2SO4 + Cr2(SO4)3 + 4H2O
392g.............................4moli
49g...........1 Eg
392g.........x Eg
x=392/49=8