Réponses

2014-02-16T18:55:24+01:00
Exercice 6 :

V = 750 ml = 0.75 l
m = 5.6 g
M = 342.3 g/mol

Y = 5.6g/0.75l = 7,46 g/l

1) C = Y/M = 7,76 g/l / 342.3 g/mol = 0.2179 mol/l

2) Vo = 250 ml = 0.25 l
    Vf = 750 ml = 0.75 l
    Co = 0.2179 mol/l

Co.Vo = Cf.Vf

Cf = (Co.Vo)/ Vf
    = (0.2179 . 0.25)/ 0.75
    = 0.07263 mol/l