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What weight of magnetite must be taken for analysis in order that, after precipitating and igniting all the iron to Fe O , the percentage of Fe O in the sample may be found by multiplying the weight in grams of the ignited precipitate by 100? !Answer!: 0.9665 gram. If exactly 12.6 cc. of the mixture are required, how many grams of MgCl per liter does the solution contain?
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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