1. 3 Fe+2 02 - t 1 Fe3O4 2. CaCO3 -> | CaO + | CO₂ 3. 1 NH4NO3 1 N₂O -> + 2 H₂O 4. 1 Pb(NO3)2 + 2 HCI→ 1 PbCl2 + 2 HNO3 5. _ Al + H2SO4 -> Al2(SO4)3 + H2 6.1 CH4+3 Ch₂ C12 -> t 1 CHCl3 + 3 HCI 7. MgCl2 + NaOH → Mg(OH)2 + NaCl 8. AgNO3 + CuCl2 ← AgCl + 9. 2 ZnS + 302 -> 2 ZnO +3 Cu(NO3)2 chao odd number 2 SO2

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A: Balance chemical equation :

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".