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Study the information in the table below and answer the questions that follow.
A mixture containing 35g of #CuSO_4# and 78g of #Pb(NO_3)_2# in 100g of water at #60^0C# was cooled to #40^0C#.
(a) Which salt crystallized out? Give a reason.
(b) Calculate the mass of salt that crystallised out.