Respuesta :

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

from balanced reaction , 3 moles of Pb(NO
₃)₂ required to produce 3 moles PbCl₂, 3:3 

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