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    Few chemistry tasks that I don't understand at all

    1. Here are few chemistry tasks,I need your help! 2. 4.120g 15% BaCl2 solution is added to 800ml 0,2mol/L Iron (III) sulphate solution.How many g of precipitate formed?Which and how much of material did not react? 5. 5g of solution,which consists of copper and zinc,is affected by...