Bài 4
Cu ko pư vs H2SO4 loãng
=> khí H2 sinh ra là do Zn pư vs H2SO4
\(Zn+H_2SO_4->ZnSO_4+H_2\)
0,15........................................0,15
n H2 =3,36 :22,4=0,15 mol
m Zn = 0,15.65=9,75g
m Cu = 12,55-9,75=2,8 g
bài 5
\(1.3Fe+2O_2->Fe_3O_4\)
\(2.Fe_3O_4+8HCl->FeCl_2+2FeCl_3+4H_2O_{ }\)
\(3.FeCl_3+3NaOH->Fe\left(OH\right)_3+3NaCl\)
\(4.Fe\left(OH\right)_3+3HCl->FeCl_3+3H_2O\)
\(5.FeCl_3+3AgNO_3->Fe\left(NO_3\right)_3+3AgCl\)
Đúng 2
Bình luận (0)
