Chapter 18, Problem 68E

Interpretation Introduction

Interpretation:

The maximum wavelength of light that will cause the following reaction needs to be deduced using bond energy data:

  ${\text{O}}_{\text{3}}\stackrel{h\nu }{\to }{\text{ O}}_{\text{2}}\text{ + O}$

Concept Introduction:

The enthalpy change, ΔH for a reaction is essentially the heat flow of the reaction taking place at constant pressure.

The change in enthalpy for a given reaction can be deduced from the difference in the total number of bonds that are broken (reactants) and the total number of bonds formed (products)

  $\text{ΔH =}{\displaystyle \sum \text{Bonds broken}}-{\displaystyle \sum \text{Bonds fromed}}\text{ ------(1)}$

The energy (E) of a photon of wavelength (λ) and frequency (ν) is given by the Planck's equation:

  $\begin{array}{l}\text{E = hν}\\ \text{or, E = h}\frac{\text{c}}{\text{λ}}\text{ -----(2)}\end{array}$

Here,

h = Planck's constant = 6.626x10-34 Js