<span>Fe2O3 + 6HCL =. 2FeCl3 + 3H2O</span>
<span>2Al(OH)3 + 3H2SO4 -> Al2(SO4)3 + 6H2O</span>
<span>2Al + 3H2SO4 -> Al2(SO4)3 + 3H2</span>
200г Х
4K+O2=2K2O; Х=200*188/156=241г.
156г 188г
n(K2O)=m/M=241/188=1.28 моль.
<span>2 Zn + O2 = 2 ZnO
</span><span>ZnO + 2 HCl = H2O + ZnCl<span>2
</span></span><span>ZnCl2 + 2 NaOH = 2 NaCl + Zn(OH)<span>2
</span></span><span>Zn(OH)2 + H2SO4 = 2 H2O + ZnSO<span>4</span></span>
1) 2TiO + 3H2SO4 = Ti2(SO4)3 + H2 + 2H2O:
2Ti+2 -2e- = 2Ti3+ | 2 | 2 | 1 |
2H+ +2e- = H2 | 2 | | 1 |;
2) 3HClO3 = HClO4 + H2O + 2ClO2:
Cl+5 -2e- = Cl+7 | 2 | 2 | 1 |
Cl+5 +e- = Cl+4 | 1 | | 2 |;
3) K2Cr2O7 + 3(NH4)2S + H2O = 2Cr(OH)3 + 3S + 6NH3 + 2KOH:
2Cr+6 +6e- = 2Cr+3 | 6 | 6 | 1 |
S-2 -2e- = S | 2 | | 3 |.