   Chapter 21, Problem 44PS

Chapter
Section
Textbook Problem

The boron trihalides (except BF3) hydrolyze completely to boric acid and the acid HX. (a) Write a balanced equation for the reaction of BCl3 with water. (b) Calculate ΔrH° for the hydrolysis of BCl3 using data in Appendix L and the following information: Δ f H °   [ BCl 3 ( g ) ] = − 403  kJ/mol;  Δ f H °   [ B ( OH ) 3 ( s ) ] = − 1094  kJ/mo

(a)

Interpretation Introduction

Interpretation:

To write the balanced chemical equation for reaction of BCl3 with water.

Concept introduction:

• Balanced chemical equation of a reaction is written according to law of conservation of mass.
• Stoichiometry of a chemical reaction is the relation between reactants and products of the reaction and it is represented by the coefficients used for the reactants and products involved in the chemical equation
Explanation

Boron trichloride on reaction with water produces the corresponding boric acid and hydrochloric acid. The equation is said to be a balanced chemical equation if the number of atoms on both the product side and the reactant side are same. Thus, the balanced chemical equation is,

BCl3(g)+3

(b)

Interpretation Introduction

Interpretation:

The enthalpy chage for the hydrolysis of BCl3 should be determined.

Concept introduction:

Enthalpy of reaction is the energy required or energy released when a chemical reaction occurs. If the process is endothermic then the energy is absorbed on formation of product. In such a case the sign of enthalpy change is positive. If the process is exothermic, then the energy is released on formation of product. In such a case the sign of enthalpy change is negative.

The standard enthalpy change is expressed as,

ΔrH°=nΔfH°(products)nΔfH°(reactants)

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