Question

Write three steps of writing chemical equations with example?

Answer 1

1. Step I: Write the chemical equation:
   For example, \[\ce{H2S2O_{7(l)} + H2O_{(l)} -> H2SO_{4(l)}}\]
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. H₂S₂O₇ has a maximum number of atoms. First balance ‘S’ as it requires a smaller factor.
   

   Number of S atoms	In the reactant (in H2S2O7)	In the product (in H2SO4)
   Initially	2	1
   To balance	2	1 × 2

   
   Apply a factor ‘2’ to the product ‘H₂SO₄’.
   \[\ce{H2S2O_{7(l)} + H2O_{(l)} -> 2H2SO_{4(l)}}\]
   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.