Question

describe the method of balancing chemical equation by taking an example

Answer 1

We take the reaction of formation of water.
H2 + O2 --> H2O (unbalanced equation for formation of water)
This equation can be balanced by using certain steps as mentioned below.

Step I: list the number of atoms of each element present on both sides of arrow.

Reactant. Product

H. 2. 2

O. 2. 1


Step II: Begin balancing with the compound having maximum number of atoms. Following this rule we select H2O. Here there are 2 oxygen atoms on the reactant side but only 1 oxygen atom on the product side. So equation is unbalanced. In order to balance we need to do following step.

 
Reactant. Product

Initial oxygen 2. 1
atom


To balance. 2. 1×2


So the equation stands out to be

H2 + O2  --> 2H2O


Step III: After balancing oxygen the equation is H2 + O2 à 2H2O. So now we need to balance hydrogen atom.

 
Reactant Product

Initial hydrogen 2. 4
atom

To balance. 2×2. 4



 So the final equation stands out to be

◆2H2 + O2 --> 2H2O.


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