Molar mass KI = 166.0028 g/mol and Pbl₂ = 461.0089 g/mol
2 Kl + Pb(NO₃)₂ ------> 2 KNO₃ + Pbl₂
2 x 166.0028 g ---------> 461.0089 g
? g KI -------------> 1.2 g
Mass KI = 1.2 x 2 x 166.0028 / 461.0089
Mass KI = 398.40672 / 461.0089
Mass KI = 0.86 g
hope this helps!
