Considering the chemical formula, there are 30 moles of O in 10 moles of KClO₃.
Chemical formulas use letters and numbers to represent chemical species, that is, compounds and ions.
The letters are called chemical symbols. They represent the elements present in the chemical species.
The numbers that accompany these letters are what we call subscripts.
A subscript is a number indicating the number of the element present in that compound. If no subscript appears after a chemical symbol, this implies that there is only one atom of that element.
In this case, the chemical formula KClO₃ indicates that 1 mole of the compound has:
So you can apply the following rule of three: if 1 mole of KClO₃ contains 3 moles of O, 10 moles of KClO₃ contains how many moles of O?
[tex]amount of moles of O=\frac{10 moles of KClO_{3} x3 moles of O}{1 moles of KClO_{3}}[/tex]
amount of moles of O= 30 moles
Finally, there are 30 moles of O in 10 moles of KClO₃.
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