Jawabanmu

2014-08-12T21:22:16+07:00
A. Dik: gr CH3COOH = 15 gr
           gr air= 180 gr
     dit: Fraksi mol?
   Penyelesaian:
Jumlah mol AIR = 180 gr/ 18 gr/mol =10 mol
jumlah mol CH3COOH = 15 gr/ 60 gr/mol = 0,25 mol
X CH3COOH = N CH3COOH/ N CH3COOH + N AIR= 0,25/ 0,25 +10 = 0,024

b. misalkan dlam 100 grlarutan NaOH trdapat 10 gr NaOH & 90 gr air
N air = 90/ 18 = 5 mol
N NaOH = 10/ 40 = 0,25
X NaOH = 0,25/ 0,25 + 5=  0,47