Answer : The number of moles of oxygen atoms are 10 moles.
Explanation : Given,
Moles of \(KMnO_4\) = 2.50 moles
By the stoichiometry we can say that in \(KMnO_4\), there are 1 moles of potassium atom, 1 mole of manganese atom and 4 moles of oxygen atoms.
That means,
As, 1 mole of \(KMnO_4\) contains 4 moles of oxygen atoms
So, 2.50 mole of \(KMnO_4\) contains \(2.50\times 4=10\) moles of oxygen atoms
Therefore, the number of moles of oxygen atoms are 10 moles.
