Write down the formula of potassium permanganate if it is known that its molecule contains one potassium

| May 10, 2021 | education

Write down the formula of potassium permanganate if it is known that its molecule contains one potassium atom, one manganese atom and four oxygen atoms. Calculate the mass fraction of elements in potassium permanganate.

Potassium Permanganate Formula: KMnO4

Mass fraction of an element in a compound is the ratio of the total relative mass of all atoms of this element to the relative molecular weight of the compound.

The relative molecular weight is equal to the sum of the relative masses of all the atoms of the elements in this compound.

Mr (KMnO4) = (Ar (K) * 1) + (Ar (Mn) * 1) + (Ar (O) * 4) = 39 + 55 + 16 * 4 = 158.

ω (K) = (Ar (K) * 1) / Mr (KMnO4) = (39 * 1) / 158 = 0.247;

ω (Mn) = (Ar (Mn) * 1) / Mr (KMnO4) = (55 * 1) / 158 = 0.348;

ω (O) = (Ar (O) * 4) / Mr (KMnO4) = (16 * 4) / 158 = 0.405.



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