nH2 = 2,24/22,4 = 0,1 mol
PTHH :
Mg + 2HCl ----> MgCl2 + H2
.0,1.......0,2..........0,1........0,1
MgO + 2HCl ----> MgCl2 + H2O
=> mMg = 0,1 . 24 = 2,4(g)
=> mMgO = 5,4 - 2,4=3(g)=> nMgO = 3/30 =0,1mol
=>\(C_M=\frac{0,1+0,1}{0,5}=0,4M\)
nH2=\(\frac{2,24}{22,4}\)=0,1(mol)
MgO+2HCl→MgCl2+H2O
0,075__0,15__0,075__0,075(mol)
Mg+2HCl→MgCl2+H2↑
0,1__0,2____0,1____0,1(mol)
mMg=0,1.24=2,4(g)
mMgO=5,4-2,4=3(g)
nMgO=\(\frac{3}{40}\)=0,075(mol)
CM=\(\frac{0,275}{0,5}\)=0,55(M)