Given the data from the question, the starting equation is
C₂H₃Br + O₂ --> CO₂ + H₂O + HBr
Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
Considering the equation given from the qustion
2C₂H₃Br + 5O₂ --> 4CO₂ + 2H₂O + 2HBr
We can see that the above equation is already balanced.
Thus, the starting equation will be the skeletal equation which is unbalanced.
Therefore, we can conclude that the starting equation is:
C₂H₃Br + O₂ --> CO₂ + H₂O + HBr
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