Answer:
8 mol
Step-by-step explanation:
Pb(NO₃)₂ + … ⟶ PbCl₂ + …
You want to convert moles of PbCl₂ to moles of Pb(NO₃)₂.
The molar ratio of Pb(NO₃)₂:PbCl₂ is 1/1.
Moles of Pb(NO₃)₂ = 8 × 1/1
Moles of Pb(NO₃)₂ = 8 mol Pb(NO₃)₂
You need 8 mol of Pb(NO₃)₂ to produce 8 mol of PbCl₂.