Question

nhiet phan hoan toan 20 g hon hop X gom MgCO3,BaCO3,CaCO3 thu duoc 10,32 g chat ran va V lit khi.

a;Tinh V lit khi b;Mat khac hoa tan 20 g hon hop X bang dung dich HCl 8,118%(D=1,05g/ml).Luong axit can du 25% so voi luong dung dich can dung duoc ddY.Tinh khoi luong muoi thu duoc trong dung dich Y va the tich dung dich axit da dung

Answer 1

a) MgCO3 -t^o-> MgO +CO2 (1)

BaCO3 -t^o-> BaO +CO2 (2)

CaCO3 -t^o-> CaO +CO2 (3)

ADĐLBTKL ta có :

mCO2=20-10,32=9,68(g)

=>nCO2=0,22(mol)

=>VCO2=4,298(l)

b) MgCO3 +2HCl --> MgCl2 +CO2 +H2O (4)

BaCO3 +2HCl --> BaCl2 +CO2 +H2O (5)

CaCO3 +2HCl --> CaCl2 +CO2+ H2O (6)

theo (1,2,3) : nX=nCO2=0,22(mol)

theo (4,5,6) : nCO2=nX=0,22(mol)

nHCl=2nX=0,44(mol)

mHCl=16,06(g)

=>mHCl( đã dùng)=\(\dfrac{16,06}{125}.100=12,848\left(g\right)\)

=>mdd HCl=158,265(g)

=>VHCl=150,72(ml)=0,12072(l)

ADĐLBTKL ta có :

mY=20+158,265-0,22.44=168,576(g)