The mercury in a 1.0451-g sample was precipitated with an excess of paraperiodic acid, H5IO6:
5Hg2+ + 2H5IO6 → Hg5(IO6)2 + 10H+
The precipitate was filtered, washed free of precipitating agent, dried, and weighed, and 0.5718 g was recovered. Calculate the percentage of Hg2Cl2 in the sample.
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