Question

what is balanced eqution? why should we balance an equation​

Answer 1

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A chemical equation in which the number of atoms of each element is same on both sides of the equation is called a balanced equation.  

Example:

$\sf{2H_{2} + O_{2} \longrightarrow 2H_{2}O}$ is a balanced equation since number of atoms of hydrogen and oxygen are same on both sides of the equation.

Balancing of equations is necessary to get the exact number of moles of the elements or compounds taking part in a chemical reaction. A balanced chemical equation can only tell the exact quantities of the reactants and products in a chemical reaction.