how to balance a chemical equation using partial equation method ?
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maximum number of atoms is selected to begin the process of balancing. If this method is not convenient, then balancing of the atoms begin with atoms, which appear minimum number of times.Atoms of elementary gases are balanced at the last.When the balancing is complete, the equation is converted to the molecular form.
Problem
12. Balance the chemical equation,
By hit and trial method.
Solution
(i) Skeletal equation
(ii) Elementary gas in atomic form
(iii) Starting with KMnO4: K and Mn are balanced
(iv) Balancing O atoms
(v) Balancing H atoms
(vi) Balancing Cl atoms
The equation is now balanced in the atomic form.
(vii) To make it molecular
So the balanced molecular equation is
Partial Equation Method
When equations contain many reactants and products they cannot be balanced by the hit and trial method. They are then balanced by the partial equation method. In this method the overall reaction is assumed to take place through two or more simpler reactions, which can be represented by partial equations. The steps involved are:
Problem
12. Balance the chemical equation,
By hit and trial method.
Solution
(i) Skeletal equation
(ii) Elementary gas in atomic form
(iii) Starting with KMnO4: K and Mn are balanced
(iv) Balancing O atoms
(v) Balancing H atoms
(vi) Balancing Cl atoms
The equation is now balanced in the atomic form.
(vii) To make it molecular
So the balanced molecular equation is
Partial Equation Method
When equations contain many reactants and products they cannot be balanced by the hit and trial method. They are then balanced by the partial equation method. In this method the overall reaction is assumed to take place through two or more simpler reactions, which can be represented by partial equations. The steps involved are:
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