Chapter 21, Problem 32PS

The boron trihalides (except BF₃) hydrolyze completely to boric acid and the acid HX.

1. (a) Write a balanced equation for the reaction of BCl₃ with water.
2. (b) Calculate Δ_rH° for the hydrolysis of BCl₃ using data in Appendix L and the following information:

$\begin{array}{ll}{\Delta }_{f}H°[{\text{BCl}}_3(\text{g})]\hfill & =-403\text{ kJ/mol; }{\Delta }_{f}H°[\text{B}{(\text{OH})}_3(\text{s})]\hfill \\ \hfill & =-1094\text{ kJ/mo}\hfill \end{array}$