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Question

Write three steps of writing chemical equations with example?

Vidyadip · Accepted 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.

	Reactants (Left side)	Product (Right side)
Element	Number of atoms	Number of atoms
H	4	2
S	2	1
O	8	4

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.

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

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.

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