Chapter 4, Problem 4.15CP

Interpretation Introduction

Interpretation:

A method to calculate ${\text{ΔH}}_{\text{R}}^{\text{0}}$ at different temperature from the given ${\text{ΔH}}_{\text{f}}^{\text{0}}$ for thechemical compounds involved in the reaction needs to be depicted.

Concept Introduction:

Enthalpy change of a reaction is the amount of heat absorbed or evolved during the reaction which takes place at constant pressure conditions.

The standard enthalpy change for a reaction ${\text{ΔH}}_{\text{R}}^{\text{0}}$ measured at 298 K and 1 atm is given in terms of the difference in the standard enthalpy of formation of the products and that of reactants.

i.e. ${\text{ΔH}}_{\text{R}}^{\text{0}}\text{ = }{\displaystyle \sum {\text{n}}_{\text{p}}{\text{ΔH}}_{\text{f}}^{\text{0}}}\text{(products) - }{\displaystyle \sum {\text{n}}_{\text{r}}{\text{ΔH}}_{\text{f}}^{\text{0}}}\text{(reactants) ------(1)}$

Here, n_p and n_r are the number of moles of the products and reactants.