Balance the following equations by inserting coefficients as needed.
1) CaCO3 +HCI--> CaCI2 + CO2 + H20
2) C6H12O2 + O2--> CO2 +H2O
3) PCI3 +CI3 --> PCI5
4) GaBr3 + CI2--> GaCI3 + Br2
5) Al4C3 + HCI --> AlCI3+ CH4
6) H2S+ LiOH--> LiS + H2O
7) SO2 + O2 --> SO3
