nH2SO4 = 0.2 mol
nHCl = 0.2 mol
Fe + H2SO4 --> FeSO4 + H2
Fe + 2HCl --> FeCl2 + H2
Mg + H2SO4 = MgSO4 + H2
Mg + 2HCl --> MgCl2 + H2
Từ PTHH :
nH2 = nH2SO4 + nHCl = 0.2 + 0.2 = 0.4 mol
VH2 = 0.4*22.4=8.96 (l)
mM = mKl + mSO4 + mCl = 12 + 0.2*96 + 0.2*35.5 = 38.3 g
Fe+2HCl----.FeCl2+H2(1)
Mg+2HCl---->MgCl2+H2(2)
Fe+H2SO4--->FeSO4+H2(3)
Mg+H2SO4---->MgSO4+H2(4)
a) n\(_{H2SO4}=0,2.1=0,2\left(mol\right)\)==>m SO4=96.0,2=19,2(g)
n\(_{HCl}=0,2\left(mol\right)\)----->m Cl=0,2.35,5=7,1(g)
n\(_{H2}=n_{HCl}+n_{H2SO4}=0,4\left(mol\right)\)
V H2=0,4.22,4=8,96(l)==> m H2=0,8(g)
b) m muối=m KL+m SO4+m Cl-m khí
=12+7,1+19,2-0,8=37,5(g)