Question

Как сделать 1 номер????

Answer 1

1.S+H2=H2S
2. H2S+Cl2= 2HCl+S
3. S+O2=SO2
4.SO2+H2O=H2SO3
5. H2SO3+2NaOH=Na2SO3+2H2O
2.
а)Na2CO3+2HNO3=2NaNO3+H2O+CO2↑
б)CuO+H2SO4=CuSO4+H2O