Find ΔHrxn for the reaction: N2O(g) + NO2(g)h3 NO(g) Use these reactions with known ΔH ’s: 2 NO(g) + O2(g)h2 NO2(g) ΔH = -113.1 kJ N2(g) + O2(g)h2 NO(g) ΔH = +182.6 kJ 2 N2O(g)h2 N2(g) + O2(g) ΔH = -163.2 kJ

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: