Question

Se da un amestec echimolecular format din acid acetic si acid propionic,cu masa de 536g. Masele acizilor din amestec sunt?

Answer 1

Notez "*" înmulțirea si "/" împărțirea (linia de fractie)
(CH3-COOH + CH3-CH2-COOH) = 536 g
60x+74y=536g
Amestec echimolar x=y
=> 60x+74x=536 => 134x=536 => x=536/134 => x=4 moli . Deci 2 moli acid acetic si 2 moli acid propionic.
n=m/M=> m=n*M=2*60 =120g acid acetic
n=m/M => m=n*M=2*74=148g acid propionic
%CH3-COOH=m/mtotal*100=120/536*100=22.38%
%CH3-CH2-COOH=m/mtotal*100=148/536*100=27.61%