MK2O = 94g/mol
n=m/M=2,35/94 = 0,025 moli K2O
C=md/ms*100 => md=C*ms/100 = 8*50/100 = 4g HCl
ms=md+mH2O => mH2O = ms-md = 50-4 = 46g
n=m/M=4/36,5 = 0,1095 moli HCl
HCl in exces
94g.....2*36,5g...2*74,5g...18g
K2O + 2HCl => 2KCl + H2O
2,35g....x=1,825g...y=3,725g....z=0,45g
md final = (4-1,825) + 3,725 = 5,9g
ms final = 5,9+(46+0,45) = 52,35g sol
Cf=mdf/msf*100 = 5,9/52,35*100 = 11,27 %