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H AsO + MgCl + 3NH OH = MgNH AsO + 2NH Cl + 3H O. !Answer!: 30.71 grams. !Answer!: 25.60 cc. If 0.6742 gram of a mixture of pure magnesium carbonate and pure calcium carbonate, when treated with an excess of hydrochloric acid, yields 0.3117 gram of carbon dioxide, calculate the percentage of magnesium oxide and of calcium oxide in the sample. !Answers!: 13.22% MgO; 40.54% CaO. 92.
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