1.
Cu(OH)2 = CuO+H2O↑
Al2O3+6HCl = 2AlCl3+3H2O
Ba(NO3)2+Na2SO4 = BaSO4↓+2NaNO3
K2O+H2O = 2KOH
Mg+ZnCl2 = MgCl2+Zn↓
Al2(SO4)3+2Na3PO4 = 3Na2SO4+2AlPO4
2.
c Na
3.
Ca+2HCl = CaCl2+H2↑
V(H2) = n(H2)*Vm
n(H2) = 2n(HCl)
n(HCl) = m(HCl)/M(HCl)
m(HCl) = ω(HCl)*m(р-ра)
V(H2) = 2ω(HCl)*m(р-ра)*Vm/M(HCl)
M(HCl) = 1+35,5 = 36,5 г*моль^-1
Vm = const = 22,4 дм^3*моль^-1
20% = 0,2
2 * 0,2 * 200 г * 22,4 дм^3 * моль^-1 / 36,5 г*моль^-1 = 49,1 дм^3