2Ba + O2 = 2BaO
BaO + H2O = Ba(OH)2
Ba(OH)2 + H2SO4 = BaSO4 + 2H2O
H2SO4+CaCl2=2HCl+CaSO4
m вещества(CaCl2)=m раствора(CaCl2)*w(CaCl2)/100%=22.2*20/100%=4.44 г
n(CaCl2)=m(CaCl2)/M(CaCl2)=4.44/111=0.04 моль
n(H2SO4)=n(CaCl2)=0.04 моль
Ответ. b
Процесс нейтрализации
H₂SO₄+2NaOH→Na₂SO₄+2H2O
K+2H2O=H2+2KOH
FeCl3+3KOH=<span>Fe(OH)3 + 3KCl
Ca+2H2O=</span>Ca(OH)2 + H2
Cu(NO3)2+2NaOH=<span>Cu(ОН) 2 + 2NaNO3
a)
2Cu+O2=2CuO
CuO+H2O=Cu(OH)2
Cu(OH)2+2HCl=CuCl2+2H2O
б)
4Na+O2=2Na2O
Na2O+H2O=2NaOH
</span><span>NaOH + HCl = NaCl + H2O</span>