Magnetite is a magnetic iron ore. Its formula is Fe,O,. 3.55 Calculate the mass in grams of (a) Construct a pair of conversion factors that relate moles of Fe (a) 1.25 mol Ca,(PO. to moles of FegO4. (b) 0.625 mmol iron (III) nitrate (b) Construct a pair of conversion factors that relate moles of Fe (c) 0.600 pmol C.H,o to moles of O in Fe,O,- (d) 1.45 mol ammonium carbonate (c) How many moles of Fe are in 2.75 mol of Fe;O,? 3.56 What is the mass in grams of (d) If this compound could be prepared from Fe,O, and O2, how (a) 0.754 mol zinc chloride many moles of Fe,O, would be needed to prepare 4.50 mol (b) 0.194 mol potassium chlorat Fe;O?