Chapter 1, Problem 57E

Interpretation Introduction

Interpretation:

The facts related to the resonance stabilization of benzene, heat of hydrogenation and fuel value of benzene and acetylene are to be determined; also the experiment to prove the existence of resonance in cyclooctatetraene is to be determined.

Concept Introduction:

The enthalpy change of the combustion reaction is calculated by the difference of sum of the enthalpy change of products and reactants.

(a)

To determine:

The comparison of heat of hydrogenation of benzene and acetylene and the greater fuel value out of $1.0\text{mol}$ benzene and $3.0\text{mol}$ acetylene; also the explanation of stability of benzene on the basis of these calculations.

Interpretation Introduction

Step 1:

To determine:

The heat of hydrogenation and fuel value of $3.0\text{mol}$ acetylene.

Interpretation Introduction

Step 2:

To determine:

The heat of hydrogenation and fuel value of $1.0\text{mol}$ benzene.

Interpretation Introduction

(b)

To determine:

The heat of hydrogenation and fuel value of toluene.

Interpretation Introduction

(c)

To determine:

The explanation of stabilization of benzene by using the given values of heat of hydrogenation.

Interpretation Introduction

(d)

To determine:

The explanation of resonance and stability of benzene on the basis of bond lengths and bond angles.

Interpretation Introduction

(e)

To determine:

The experiment to prove the existence of resonance in cyclo octatetraene.