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Good one. Fe2O3 is 160g/mol, so %comp of Fe is 112/160=0.7 or 70%. 1x106g Fe/70=x/30, so x=428,571g O2, so mass of Fe2O3 is 1,428,571g. 1,428,571/78=x/22, so x=402,930g of other rock, so mass of ore deposit = 1,428,571+402,930=1,831,501g=1,831.5kg.
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Q: The rock in a particular iron ore deposit contains 78 percent Fe2O3 by mass how many kilograms of the rock must be processed to obtain 1000kg of iron?
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