Molecular weight of KMnO, is "M". In a reaction KMnO, is reduced to
K2Mn04. The equivalent weight of KMnO, is
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We can also see that the oxidation state of manganese is +7 in permanaganate ion and it changes to +6 in manganate ion. That is, the oxidation state changes by 1. Hence, the equivalent mass of KMnO4 is M when it converts over to K2MnO4.
Explanation:
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