Zn + 2H2SO4 -> ZnSO4 + SO2 + 2H2O
1:+1 и -2;
2: +4 и -1
3: +6 и -1
4: +3 и -1
5:+4 и -2
Находим количество вещества μ=m/M=9/18=0,5 моль.N=N(a)*μ=10²³*6/2=3*10²³ молекул воды всего.молекулы кислорода/молекулы водорода=1/2<span>мол.водорода= 2*3*10²³/3=2*10²³молекул!!!</span>
Ответ:
Ca3(PO4)2->H3PO4->H4P2O7->HPO3
1) 3 CaO+2 H3PO4 -> Ca3(PO4)2+3 H2O
2) 2 H3PO4 -> H4P2O7+H2O
3)H4P2O7 (t)-> 2 HPO3+H2O
FeCl₃ + 3NaOH = Fe(OH)₃ + 3NaCl
2Fe(OH)₂ = Fe₂O₃ + H₂O
Fe₂O₃ + 3H₂ = 2Fe + 3H₂O
Fe + 2HCl = FeCl₂ + H₂
FeCl₂ + 2NaOH = Fe(OH)₂ + 2NaCl
Fe(OH)₂ = FeO + H₂O
FeO + H₂ = Fe + H₂O
2Na + O₂ = Na₂O₂
Na₂O₂ + 2Na = 2Na₂O
Na₂O + H₂O = 2NaOH
2NaOH + H₂CO₃ = Na₂CO₃ + 2H₂O
Na₂CO₃ + CO₂ + H₂O = 2NaHCO₃
NaHCO₃ + HNO₃ = NaNO₃ + CO₂ + H₂O
2NaNO₃ = 2NaNO₂ + O₂
Si + O₂ = SiO₂
SiO₂ + 2NaOH = Na₂SiO₃ + H₂O
Na₂SiO₃ + 2HCl = 2NaCl + H₂SiO₃
H₂SiO₃ = SiO₂ + H₂O
SiO₂ + 2Mg = Si + 2MgO
Si + 4Mg = Mg₂Si + 2MgO
Mg₂Si + 4H₂O = 2Mg(OH)₂ + SiH₄