We adjust the chemical equation because it only determines the number of
molecules of the substance but the subscript cannot be altered because it
is the actual chemical composition of the natural substance.
The number placed in front of a chemical formula is called the coefficient
and it only determines the number of molecules.
The Coefficient only gives the amount in molecules of the chemical
formula.
This can easily be changed in a chemical reaction because it is the number
of molecules(quantity) that goes into the reaction.
On the other hand the subscript is the natural chemical composition of
the formula.
Altering the subscript will change the natural substance itself.
For example the natural chemical composition of water is H₂O .
The subscript cannot be altered in a reaction because it changes the
compound entirely if it is altered. The compound will no longer be water if
altered.
But we can add a coefficient of 2, 4, 5 etc to water in a chemical equation
because it only determines the number of moles of water.
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