Answer to Question #256203 in General Chemistry for jjjuih

Question

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

Answer 1

The heat evolved in the reaction = 119.9 J - 2.68 J = 117.22 J

2.88 x 10^-3 mol of Br2 evolves 117.22 J of heat

so 1.00 mol of Br2 will evolve :

= (1.00 mol x 117.22 J) / (2.88 x 10^-3)

= 40701 J of heat