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3 Pb(NO₃)₂ + 2 AlCl₃ → 3 PbCl₂ + 2 Al(NO₃)₃ 

from balanced reaction , 3 moles of Pb(NO₃)₂ required to produce 3 moles PbCl₂, 3:3 

8 moles PbCl₂ x (3/3) = 8 moles Pb(NO₃)₂ required