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Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781337398909

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Chapter
Section
BuyFindarrow_forward

Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781337398909
Chapter 10, Problem 8CO
Textbook Problem
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. use tabulated data to calculate the free energy change in a chemical reaction.

Interpretation Introduction

Interpretation: We have to find out the free energy change in a chemical reaction using the change in enthalpies and entropies of the reaction.

Concept introduction: The free energy change of a chemical reaction when the reactants and products are in their standard states (25°C,1atmpressure).

To determine: The free energy change in a chemical reaction.

Explanation of Solution

Free energy change in a chemical reaction is calculate by using formulae,

ΔG°=ΔH°-TΔS°ΔH°-StandardenthalphychangeofthereactionTΔS°-StandardentropychangeofthereactionattemperatureT

Standard enthalpy changes of compounds

Reaction ΔHf°kJmol-1
CO(g)+12O2(g)CO2 282.84
12H2(g)+12F2(s)HF(g) 271.1
Ca(s)+12O2(g)CaO(s) 635.5

Standard entropy changes of elements

Substance Absolute entropy ( JK -1 mol -1 )
Hydrogen (g) 130.60
Nitrogen (g) 191

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Chapter 10 Solutions

Chemistry for Engineering Students
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