Penjelasan:
mmol La³⁺ = 50 × 0.25 = 12.5
mmol IO₃⁻ = 75 × 0.302 = 22.65
find limiting reactant:
7.55 < 12.5 so IO₃⁻ = limiting reactant (reactant that is totally consumed when the chemical reaction is completed.)
chemical reaction is in the pic:
mass of La(IO₃)₃ = mmol × Mr = 7.55 × 663.6 = 5010.18 mg
= 5.01018 gr