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The molar mass of a potassium permanganate is 158.04 grams per mole. This is to say that the mass of one mole of potassium permanganate is 158.04 grams or that 6.02 x 10 to the 23rd power ions of potassium permanganate have a mass of 158.04 grams.
The Mole
A mole (abbreviated mol), is 6.02 x 10 to the 23rd power (Avogadro's number). It is more specifically described as the number of entities in 12 grams of carbon.
Molar Mass
The molar mass of a substance is the mass of one mole (6.02 x 10 to the 23rd power of atoms or molecules) of the substance. It is determined from the atomic weight of each atom in the substance.
Example of Molar Mass
The atomic mass of carbon is 12 atomic mass units. The molar mass of carbon would be 12 grams per mole. Another way to describe this is to say that 6.02 x 10 to the 23rd power of carbon atoms has a mass of 12 grams.
Chemical Formula for Potassium Permanganate
The chemical formula of potassium permanganate is KMnO4. This indicates one potassium (K) atom, one manganese (Mn) atom, and four oxygen (O) atoms.
Molar Mass of Potassium Permanganate
The molecular weight of potassium permanganate is 158.04 amu (atomic mass units). This is determined by adding the atomic mass of each element in the compound. In potassium permanganate, the atomic masses for the elements are 39.10 for potassium, 54.94 for manganese, and 16.00 for each oxygen. This totals to 158.04 (39.10 + 54.94 + 16.00 + 16.00 + 16.00 + 16.00 = 158.04).
Source:
The International System of Units (SI)
Periodic Table of the Elements
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