1)2H2S + 3O2 = 2SO2 + 2H2O
<span>2)SO2 + H2O = H2SO3
3)</span><span>H2SO3 + 2NaOH = Na2SO3 + 2H2O
4)</span><span>Na2SO3 + 2HCl = 2NaCl + SO2↑ + H2O
</span>
<span>2(NH4)2CrO4 = Cr2O3 + N2 + 5H2O + 2NH3
</span>Cr(+6) + 3e = Cr(+3) |3|2 - окислитель
2N(-3)-6e = N2(0) |6| 1 - восстановитель
2Al+6NaOH=2Na3AlO3+3H2∧
2Al+6Na+6OH=6Na+2Al+6O+3H2
M(CO2)=44 g/mol
m(CO2)=n(CO2)*M(CO2) = 3*44=132 g
2BrCl+H2So4=Br2So4+2HCl
2NaBr+Cl2=2NaCl+Br2
Br2+2Na=2NaBr