141. Solving a chemistry problem
Calcined precipitates of 0.1080 g Fe2O3 and 0.2660 g Mg2P2O7 were obtained from a 5.0000 g sample of limestone. The filtrate obtained after precipitation of MgNH4PO4 was diluted to 200.0 ml, and CaC2O4 was precipitated from 20.00 ml of the solution. Calcium oxalate was converted to CaSO4 weighing 0.6105. Calculate the percentage of FeO, MgO and CaO in limestone.
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