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Iron Ores Magnetite Siderite Iron Pyrite And Hematite For Figures

69.9 to three significant figures.First find the total mass of the compound 3xx 15.999 48 grams for oxygen 2 xx 55.8 111.6 grams for iron adding these gives 159.6 grams per molecules fe2o3 now divide the mass of iron by the total mass for the compound.111.6159.6.6992481 change this to a percentage by multiplying by 100 and round off to three significant figures gives 69.9 iron.

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