There are eight moles of oxygen atoms in 1 mole of Mn9(ClO4)2.
We know that a compound is composed of atoms. The atoms that make up the molecule are chemically combined. It is usual that the number of atoms in the compound would correspond with the chemical formula.
Now we have the compound Mn9(ClO4)2. In one mole of the compound we have;
Thus, there are eight moles of oxygen atoms in 1 mole of Mn9(ClO4)2.
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