. ... Example 2. Zn + HCl ---> ZnCl2 + H2 ... Example 3. Ca(OH)2 + H3PO4 ---> Ca3(PO4)2 + H2O. ... Example 4. FeCl3 + NH4OH ---> Fe(OH)3 + NH4Cl. ... Example 5. S8 + F2 ---> SF6 ... Example 6. C2H6 + O2 ---> CO2 + H2O. ... Example 7. Al2(CO3)3 + H3PO4 ---> AlPO4 + CO2 + H2O. Summary To be useful, chemical equations must always be balanced. Balanced chemical equations have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be the simplest whole number ratio. Mass is always conserved in chemical reactions. mber of atoms of each element in reactants is not equal to the number of atoms of each element present in product, then the chemical equation is called unbalanced chemical equation. An equation is balanced when the same number of each element is represented on the reactant and product sides. Equations must be balanced to accurately reflect the law of conservation of matter.
