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Using half reactions, write the equation for MnO4- reacting with H2O2 in acid solution to give Mn2+ and O2

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MnO4^- ==> Mn^2+
H2O2 ==> O2
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Here is a site that shows you how to do this. Follow up with any questions regarding what you don't understand.
To help you get started, Mn changes from +7 on the left to +2 on the right. O2 changes from -2 on the left (for both of them) to zero on the right (for both of them).
http://www.chemteam.info/Redox/Redox.html
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