Part A

Manganese is derived from pyrolusite ore, an impure manganese dioxide. In the procedure used to analyze a pyrolusite ore for its $Mn{O}_2$ content, a $0\mathrm{.}533g$ sample is treated with $1\mathrm{.}651g$ oxalic acid $(H_2{C}_2{O}_4*2H_{2}O)$ in an acidic medium.

Following this reaction, the excess oxalic acid is titrated with $0\mathrm{.}1000MKMn{O}_4,30\mathrm{.}06mL$ being required.

You may want to reference $($Page$)$ Section $5\mathrm{.}1$ while completing this problem.

What is the mass percent $Mn{O}_2$ in the ore?

$H_2{C}_2{O}_4+Mn{O}_2+H^{+}M{n}^{2+}+H_{2}O+C{O}_2(not$ balanced$)$

$H_2{C}_2{O}_4+Mn{O}_4^{-}+H^{+}M{n}^{2+}+H_{2}O+C{O}_2(not$ balanced$)$

Express the anwer in percent to three significant figures.

$\%Mn{O}_2=$

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