Question
Write three steps of writing chemical equations with example?
✓
Answer
1. Step I: Write the chemical equation:
For example, $H _2 S _2 O _{7( l )}+ H _2 O _{( l )} \longrightarrow H _2 SO _{4( l )}$
2. Step II: Compare the number of atoms of the various elements present on the two sides of the equation.
3. Step III: Choose the reactant or product having a maximum number of atoms and equalize its atoms on both sides. Equalize the number of atoms of remaining elements in the reactants and products. $H _2 S _2 O _7$ has a maximum number of atoms. First balance ' $S$ ' as it requires a smaller factor.
Apply a factor ' 2 ' to the product ' $H _2 SO _4$ '.$ H _2 S _2 O _{7( l )}+ H _2 O _{( l )} \longrightarrow 2 H _2 SO _{4( l )} $Check whether the equation is balanced. The number of atoms of the elements in the reactants is same as the number of atoms of those elements in the product.
For example, $H _2 S _2 O _{7( l )}+ H _2 O _{( l )} \longrightarrow H _2 SO _{4( l )}$
2. Step II: Compare the number of atoms of the various elements present on the two sides of the equation.
| Reactants (Left side) | Product (Right side) | |
| Element | Number of atoms | Number of atoms |
| H | 4 | 2 |
| S | 2 | 1 |
| O | 8 | 4 |
| Number of S atoms | In the reactant,(in H_(2)S_(2)O_(7) ) | In the product,(in H_(2)SO_(4) ) |
| Initially | 2 | 1 |
| To balance | 2 | 1x2 |
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