CaCO3 +2HCl --> CaCl2 + CO2+ H2O
n CaCO3 = 0,1mol; n HCl= 2.0,15=0,3mol => HCl dư => nHCl dư= 0,3-0,1.2=0,1mol =>mHCl= 0,1.36,5=3,65g
m CaCl2= 0,1.111=11,1g
mdd = m ban đầu - m khí = 10 +150.1,2 - 0,1.44=185,6g
C% HCl dư= 3,65:185,6.100%=2%
C% CaCl2= 11,1:185,6.100%=6%