A 5.00 × 10^2 g sample of Al2(SO4)3 is made to react with 4.50 × 10^2 g of Ca(OH)2. The balanced equation is: Al2(SO4)3(aq) + 3Ca(OH)2(aq) → 2Al(OH)3(s) + 3CaSO4(s) How many moles of excess reagent are unreacted?

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