Запишите уравнения реакций по схеме:
C → CH4 → CO2
↓
CaC2 → C2H2
С+2H2=CH4
CH4+2O2=CO2+2H2O
Ca+2C=CaC2
CaC2+H2=C2H2+Ca
CaC2+2H2O=Ca(OH)2+C2H2
1)C+2H2---->CH4
2)CH4+2O2--(t)->CO2+2H2O
3)CaO+3C--->CaC2+CO
4)CaC2+2H2O---> Ca(OH)2 + C2H2