Physical Chemistry
Physical Chemistry
3rd Edition
ISBN: 9780321812001
Author: ENGEL, Thomas/ Reid
Publisher: Pearson College Div
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Chapter 4, Problem 4.6NP
Interpretation Introduction

Interpretation:

A formula for the standard enthalpy of formation at temperature T for the reaction:

  CO(g) + 1/2O2(g)  CO2(g) , needs to be derived.

Concept Introduction:

The standard enthalpy change for a reaction ΔH0 is given in terms of the difference in the standard enthalpy of formation of the products and that of reactants.

i.e. ΔH0 = npΔHf0(products) - nrΔHf0(reactants)  ------(1)

np and nr are the number of moles of the products and reactants

The enthalpy of formation at temperature T is related to the standard enthalpy of formation at 298 K by the following equation:

  ΔHf0(T) = ΔHf0(298K) + 298T ΔCpdT ------(2)where ΔCp=Cp(products)Cp(reactants) i.e. the difference in the heatcapacities of the products and reactants

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