a)H2SO4+BaCl2--->BaSO4+2HCl
m dd H2SO4=38,168.1,31=50(g)
m H2SO4=50.19,6/100=15,68(g)
n H2SO4=15,68/98=0,16(mol)
m baCl2=208.10/100=20,8(g)
n BaCl2=20,8/108=0,1(mol)
-->H2SO4 dư.
n BaSO4=n BaCl2=0,1(mol)
m baSO4=0,1.233=23,3(g)
Muối sau pư là baSO4 luôn rồi nha
b) m dd sau pư=50+208-23,3=234,7(g)
n H2SO4=n BaCl2=0,1(mol)
n H2SO4 dư=0,16-0,1=0,06(mol)
m H2SO4 dư=0,06.98=5,88(g)
C% H2SO4=5,88/234,7.100%=2,5%
n HCl=2n BaCl2=0,2(mol)
m HCl=0,2.36,5=73(g)
C% HCl=73/234,7.100%=31,1%