The normal boiling point of a certain liquid X is 92.1 oC, but when 70 g of (NH4)2SO4 are dissolved in 631 g of X, the solution boils instead at 96.4 oC. Use this information to calculate the molal boiling point elevation constant, Kb, of X.

The data below were determined for the reaction shown below. s2o82– + 3i – (aq) → 2so42– + i3– expt. # [s2o82–] (m) [i –] (m) initial rate 1 0.038 0.060 1.4 × 10 – 5 m/s 2 0.076 0.060 2.8 × 10 – 5 m/s 3 0.076 0.030 1.4 × 10 – 5 m/s the rate law for this reaction must be: