Помогите! H₂O⇒H₂⇒BrH⇒CaBr₂⇒?⇒CO₂

Question

Помогите!
H₂O⇒H₂⇒BrH⇒CaBr₂⇒?⇒CO₂

Answer 1

1)2H2O=2H2+O2
2)Br2+H2=2HBr
3)CaCO3+2HBr=CaBr2+CO2+H2O
4)CaBr2+K2CO3=CaCO3+2KBr
5)CaCO3=CO2+CaO