First identify the molar fixed of Fe2O3. Include the atomic weights of two iron atoms and also three oxygen atoms. The should include to about 159.7, which i do not care the molar mass once we assign the unit g/moles. If we have 205 g of Fe2O3, then divide the fixed by the molar mass:

205g/(159.7 g/mole)

Note just how the grams cancel and mole move to the top. Express the prize in 3 sig figs. Without calculating, you should see that the answer need to be a little over 1 mole. You have 205 g, and one mole calls for 159.7 grams. It"s an excellent to predict solution before calculating, just to check on even if it is you"ve gotten in the exactly keystrokes.

You are watching: How many moles of fe2o3 are in 171 g of the compound

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