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Balance the following chemical equations...

Balance the following chemical equations.
a) `Al + O_2 rarr Al_2O_3`
b) `KClO_3 rarr KCl + O_2`
c) `Mg +O_2 rarr MgO`

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a) .4Al +3 O_2 rarr 2Al_2O_3.
b) .2KClO_3 rarr 2KCl + 3O_2.
c) .2Mg +O_2 rarr 2MgO.
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