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1)
дано
m(Ba)=20 g

V(H2)-?
20                                  X L
Ba+2H2O-->Ba(OH)2+H2↑ M(Ba)=137 g/mol , Vm-22.4 L/mol
137                               22.4
20/137 = X/22.4
X=3.27L
ответ 3.27 л
2)
дано
m(Zn)=25 g

V(H2)-?
25                            X
Zn+2HCL-->ZnCl2+H2↑ M(Zn)=65g/mol, Vm=22.4 L/mol
65                            22.4
25/65 = X/22.4
X=8.62 l
ответ 8.62 л
3)
дано
m(Cr2O3)=50 g

m(Cr)-?
50                       X
Cr2O3+3H2-->2Cr+3H2O M(Cr2O3)=152 g/mol,M(Cr)=52g/mol
152                    2*52
50/152 = X/104
X=34.21g
ответ 34.21 г

1) MgSO4 + 2NaOH = Na2SO4 + Mg(OH)2↓
    Mg(2+) + SO4(2-) + 2Na(+) + 2OH(-) = 2Na(+) + SO4(-) + Mg(OH)2↓
    Mg(2+) + 2OH(-) = Mg(OH)2↓
2) CuSO4 + BaCl2 = CuCl2 + BaSO4↓
    Cu(2+) + SO4(2-) + Ba(2+) + 2Cl(-) = Cu(2+) + 2Cl(-) + BaSO4↓
    SO4(2-) + Ba(2+) = BaSO4↓
3) Ca(NO3)2 + K2SO3 = CaSO3↓ + 2KNO3
    Ca(2+) + 2NO3(-) + 2K(+) + SO3(2-) = CaSO3 + 2K(+) + NO3(-)
    Ca(2+) + SO3(2-) = CaSO3↓
4) ZnCl2 + 2NaOH = 2NaCl + Zn(OH)2↓
    Zn(2+) + 2Cl(-) + 2Na(+) + 2OH(-) = 2Na(+) + Cl(-) + Zn(OH)2↓
    Zn(2+) + 2OH(-) = Zn(OH)2↓
5) Hg(NO3)2 + 2NaI = 2NaNO3 + HgI2↓
    Hg(2+) + 2NO3(-) + 2Na(+) + I(-) = 2Na(+) + 2NO3(-) + HgI2↓
    Hg(2+) + I(-) = HgI2↓