Chapter 5, Problem 56QP

Interpretation Introduction

Interpretation:

The value of enthalpy change for the given reaction is to be determined.

Concept introduction:

The change in the enthalpy of a reaction, when the reactants are converted into products, is the same, regardless of whether the reaction takes place in one step or in many steps. This law is known as Hess’s law.

For any reaction, the change in enthalpy, called as the enthalpy of reaction $\text{ΔH}$, is defined as the difference between the enthalpies of the products and the reactants. Equation for enthalpy of reaction is $\text{ΔH=H}\left(\text{products}\right)\text{ -H}\left(\text{reactants}\right)$

On reversing any equation, the sign of the enthalpy will be changed.