Liquid bromine dissolves readily in aqueous NaOH:

Br2(l) +2NaOH(aq) → NaBr(aq) + NaOBr(aq) + H2O(l) . Suppose 2.88 x 10-3 mol of Br2(l) is sealed in a glass capsule that is then immersed in a solution containing excess NaOH (aq). The capsule is broken the mixture is stirred, and a measured 121.3 J of heat evolves. In a separate experiment, simply breaking an empty capsule and stirring the solution in same way evolves 2.34 J of heat. The heat evolved as 1.00 mol Br2(l) dissolves in excess of NaOH (aq) is