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A 4.853 g sample containing Zn2+ is dissolved and treated with excess (NH4)2HPO4 , resulting in the formation of the precipitate ZnNH4PO4⋅H2O . The precipitate is filtered, washed, dried, and then ignited to convert the precipitate to Zn2P2O7 . The mass of Zn2P2O7 collected was 0.948 g. Calculate the weight percent of Zn2+ in the original sample.