Physical Chemistry
Physical Chemistry
3rd Edition
ISBN: 9780321812001
Author: ENGEL, Thomas/ Reid
Publisher: Pearson College Div
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Chapter 8, Problem 8.39NP
Interpretation Introduction

Interpretation:

The vapor pressure of formic acid at 298.15 K from the given standard Gibbs free energy of formation of liquid and gaseous formic acid needs to be calculated

Concept Introduction:

The standard Gibbs free energy change for a reaction ΔG0 is given in terms of the difference in the standard enthalpy of formation of the products and that of reactants.

  ΔGR0 = npΔGf0(products) - nrΔGf0(reactants)  ------(1)

The Gibbs free energy for a reaction at equilibrium is related to the equilibrium constant (K) through the Gibbs-Helmholtz isotherm:

  lnK = ΔGR0RT -----(2)

Where R = 8.314 J/mol-K and T is the temperature

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