Kinetic study of the reaction of lead metal with hydrogen bromide in the temperature range 448–548 K

Abstract

The kinetics of the reaction of lead metal with hydrogen bromide have been studied gravimetrically using a silica spring microbalance in the temperature range 448–548 K. The reaction follows a linear rate law at all temperatures studied, indicating facile access of HBr to the metal, with rate constants ranging from 0.633 × 10^–9 mol s^–1 at 448 K to 5.584 × 10^–9 mol s^–1 at 548 K, giving lead(II) bromide as the sole reaction product. From the data, a value of 43.8(3) kJ mol^–1 was determined for the activation energy of the reaction. The principal contribution to the activation energy was considered to arise from the dissociative chemisorption of HBr.