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A 2.0 g sample containing MnO2 is treate...

A 2.0 g sample containing `MnO_2` is treated with HCl liberating `Cl_2`. The `Cl_2` gas is passed into a solution of KI and 60.0 mL of 0.1 M `NaS_2O_3` is required to titrate the liberated iodine. The percentage of `MnO_2` in the sample is _________. (Nearest integer)
[Atomic masses (in u) Mn = 55: Cl = 35.5: O = 16. I = 127. Na = 23, K = 39, S = 32]

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