Chapter 2, Problem 2F.7E

Interpretation Introduction

Interpretation:

Standard enthalpy of hydrogenation of cyclohexene into cyclohexane has to be calculated.

Concept Introduction:

Heat of vaporization: At constant temperature and pressure, the amount of heat entails to convert a liquid into a gas. A gas produced same quantity of heat when it converts liquid.

Enthalpy$\left(H\right)$: it is the total amount of heat in a particular system.

The value of heat formed in a reaction $\text{ΔH}$ is calculated by the formula,

$\text{ΔH=}{{\displaystyle \sum \left(BondDissociationEnergy\right)}}_{\left(\text{reactants}\right)}-{{\displaystyle \sum \left(BondDissociationEnergy\right)}}_{\left(\text{products}\right)}$

If the value obtained for $\text{ΔH}$ in a reaction is positive then it is an endothermic reaction whereas the value obtained for $\text{ΔH}$ is negative it is an exothermic reaction.

Energy of Combustion: The energy released in the form of heat when given substance undergoes combustion reaction.

Enthalpy change: It is defined as the amount of heat released or absorbed by the chemical reaction at constant pressure conditions.