The equivalent mass of is half its molar mass when it is converted to:

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Problem

The equivalent mass of

\text{MnSO}_4

is half its molar mass when it is converted to: (1)

\text{Mn}_2\text{O}_3

(2)

\text{MnO}_2

(3)

\text{MnO}_4^-

(4)

\text{MnO}_4^{2-}