Write and balance the equation.
Convert 2.55 g Zn to moles.
Using the coefficients in the balanced equation, convert moles Zn to moles KMnO4.
Then M = moles/L. You know M and moles, solve for L.
Determine the volume of a 0.550 M KMnO4 solution required to completely react with 2.55 g of Zn.
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