(a) How many moles of ammonium ions are in 0.438 g of ammonium carbonate? ______ mol (b) What is the mass, in grams, of 0.0442 mol of iron(III) phosphate? _______ g (c) What is the mass, in grams, of 4.54 10²³ molecules of aspirin, C₉H₈O₄? _______ g (d) What is the molar mass of diazepam (Valium^(R)) if 0.05570 mol weighs 15.86 g? ________ g/mol