The coefficient for oxygen is 1, and so is not written. The equation is already balanced.
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Which coefficient ?The chemical formula of magnesium chloride is MgCl2.The chemical formula of sodium chloride is NaF..
A coefficient in front of a formula represents the number of molecules or formula units. It applies to all the atoms within that molecule or formula unit. For example, in the formula 2H₂O, the coefficient '2' means there are two water molecules, resulting in a total of 4 hydrogen atoms and 2 oxygen atoms.
The number written to the left of a chemical formula is called a coefficient. It represents the ratio of moles of each substance in a chemical reaction.
Coefficient
The subscripts tell you how the atoms are bound together. The coefficient tells you how many atoms there are.