Question

Se supune esterificarii un amestesc echimolar de etanol si acid acetic cu masa de 1060g. Indicati cantitatea de acetat de etil obtinuta daca constanta de echilibri a esterificarii are valoarea kc=4. A- 264g
B-440g
C- 308g
D- 586g
E- 293g

Answer 1

                   CH3-CH2-OH       +      CH3-COOH ⇄   CH3-CH2OCOCH3 + H2O
initial :          10 moli                             10 moli
a reactionat :      x                                    x
la echilibru :    (10-x)                         (10-x)                          x                              x
46n + 60n = 1060  106n = 1060  ⇒ n = 10 moli
Kc = [ester][apa]/{[alcool][acid]}
x²/(10-x)² = 4      x/(10-x) = 2     x = 20 - 2x   x = 20/3
m ester = 20/3 ·88 = 586,66g