How many moles of oxygen atoms are present in 0.250 mol of potassium permanganate, KMnO4?
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Correct answer
B. 1.00 mol
Principle or equation
The chemical formula indicates the number of atoms of each element per formula unit. For KMnO4, there are 4 oxygen atoms per formula unit.
Why this answer is correct
Multiply the number of moles of the compound by the number of oxygen atoms per formula unit: 0.250 mol × 4 = 1.00 mol of oxygen atoms.
Example
For 0.300 mol of Na2SO4, moles of oxygen atoms = 0.300 × 4 = 1.20 mol.
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