SlideShare una empresa de Scribd logo
1 de 10
Descargar para leer sin conexión
1
Hess’s Law
Start
Finish
A State Function: Path independent.
Both lines accomplished the same
result, they went from start to finish.
Net result = same.
2
Determine the heat of reaction for the reaction:
4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g)
Using the following sets of reactions:
N2(g) + O2(g)  2NO(g) ∆H = 180.6 kJ
N2(g) + 3H2(g)  2NH3(g) ∆H = -91.8 kJ
2H2(g) + O2(g)  2H2O(g) ∆H = -483.7 kJ
Hint: The three reactions must be algebraically
manipulated to sum up to the desired reaction.
and.. the ∆H values must be treated accordingly.
3
4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g)
Using the following sets of reactions:
N2(g) + O2(g)  2NO(g) ∆H = 180.6 kJ
N2(g) + 3H2(g)  2NH3(g) ∆H = -91.8 kJ
2H2(g) + O2(g)  2H2O(g) ∆H = -483.7 kJ
Goal:
NH3:
O2 :
NO:
H2O:
Reverse and x 2 4NH3  2N2 + 6H2 ∆H = +183.6 kJ
Found in more than one place, SKIP IT (its hard).
x2 2N2 + 2O2  4NO ∆H = 361.2 kJ
x3 6H2 + 3O2  6H2O ∆H = -1451.1 kJ
4
4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g)Goal:
NH3:
O2 :
NO:
H2O:
Reverse and x2 4NH3  2N2 + 6H2 ∆H = +183.6 kJ
Found in more than one place, SKIP IT.
x2 2N2 + 2O2  4NO ∆H = 361.2 kJ
x3 6H2 + 3O2  6H2O ∆H = -1451.1 kJ
Cancel terms and take sum.
4NH3
+ 5O2  4NO + 6H2O ∆H = -906.3 kJ
Is the reaction endothermic or exothermic?
5
Determine the heat of reaction for the reaction:
C2H4(g) + H2(g)  C2H6(g)
Use the following reactions:
C2H4(g) + 3O2(g)  2CO2(g) + 2H2O(l) ∆H = -1401 kJ
C2H6(g) + 7/2O2(g)  2CO2(g) + 3H2O(l) ∆H = -1550 kJ
H2(g) + 1/2O2(g)  H2O(l) ∆H = -286 kJ
Consult your neighbor if necessary.
6
Determine the heat of reaction for the reaction:
Goal: C2H4(g) + H2(g)  C2H6(g) ∆H = ?
Use the following reactions:
C2H4(g) + 3O2(g)  2CO2(g) + 2H2O(l) ∆H = -1401 kJ
C2H6(g) + 7/2O2(g)  2CO2(g) + 3H2O(l) ∆H = -1550 kJ
H2(g) + 1/2O2(g)  H2O(l) ∆H = -286 kJ
C2H4(g) :use 1 as is C2H4(g) + 3O2(g)  2CO2(g) + 2H2O(l) ∆H = -1401 kJ
H2(g) :# 3 as is H2(g) + 1/2O2(g)  H2O(l) ∆H = -286 kJ
C2H6(g) : rev #2 2CO2(g) + 3H2O(l)  C2H6(g) + 7/2O2(g) ∆H = +1550 kJ
C2H4(g) + H2(g)  C2H6(g) ∆H = -137 kJ
7
Summary:
enthalpy is a state function
and is path independent.
8
9
Standard Enthalpies of formation:
10
Thermodynamic Quantities of Selected Substances @ 298.15 K

Más contenido relacionado

La actualidad más candente

Chemical equilibrium
Chemical equilibriumChemical equilibrium
Chemical equilibriumamna munir
 
Standard Enthalpy Formation
Standard Enthalpy FormationStandard Enthalpy Formation
Standard Enthalpy FormationLumen Learning
 
Chapter 5 lecture- Thermochemistry
Chapter 5 lecture- ThermochemistryChapter 5 lecture- Thermochemistry
Chapter 5 lecture- ThermochemistryMary Beth Smith
 
Chem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S I
Chem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S IChem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S I
Chem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S ILumen Learning
 
Energy Changes
Energy ChangesEnergy Changes
Energy ChangesEmersius
 
Chapter Three Lecture- Stoichiometry
Chapter Three Lecture- StoichiometryChapter Three Lecture- Stoichiometry
Chapter Three Lecture- StoichiometryMary Beth Smith
 
Enthalpy and Internal Energy
Enthalpy and Internal EnergyEnthalpy and Internal Energy
Enthalpy and Internal EnergyLumen Learning
 
Enthalpy, Calorimetry, Hess's Law
Enthalpy, Calorimetry, Hess's LawEnthalpy, Calorimetry, Hess's Law
Enthalpy, Calorimetry, Hess's LawDixi Dawn
 
Chemical Reactions: Thermochemistry
Chemical Reactions: ThermochemistryChemical Reactions: Thermochemistry
Chemical Reactions: Thermochemistryulcerd
 
Ppt chemical reactions
Ppt chemical reactionsPpt chemical reactions
Ppt chemical reactionskstalke47
 
5.4 exothermic and endothermic reactions
5.4 exothermic and endothermic reactions5.4 exothermic and endothermic reactions
5.4 exothermic and endothermic reactionsMartin Brown
 

La actualidad más candente (20)

Lesson 3 hess' law
Lesson 3 hess' lawLesson 3 hess' law
Lesson 3 hess' law
 
Thermochemistry
ThermochemistryThermochemistry
Thermochemistry
 
Chemical equilibrium
Chemical equilibriumChemical equilibrium
Chemical equilibrium
 
Standard Enthalpy Formation
Standard Enthalpy FormationStandard Enthalpy Formation
Standard Enthalpy Formation
 
Chapter 5 lecture- Thermochemistry
Chapter 5 lecture- ThermochemistryChapter 5 lecture- Thermochemistry
Chapter 5 lecture- Thermochemistry
 
Chem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S I
Chem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S IChem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S I
Chem 2 - The Second Law of Thermodynamics: Spontaneous Reactions and Entropy S I
 
Enthalpy change
Enthalpy changeEnthalpy change
Enthalpy change
 
Gas Laws
Gas LawsGas Laws
Gas Laws
 
Enthalpy Hess's Law
Enthalpy Hess's LawEnthalpy Hess's Law
Enthalpy Hess's Law
 
Thermochemistry
ThermochemistryThermochemistry
Thermochemistry
 
Entropy
EntropyEntropy
Entropy
 
Energy Changes
Energy ChangesEnergy Changes
Energy Changes
 
Chapter Three Lecture- Stoichiometry
Chapter Three Lecture- StoichiometryChapter Three Lecture- Stoichiometry
Chapter Three Lecture- Stoichiometry
 
Enthalpy and Internal Energy
Enthalpy and Internal EnergyEnthalpy and Internal Energy
Enthalpy and Internal Energy
 
Enthalpy, Calorimetry, Hess's Law
Enthalpy, Calorimetry, Hess's LawEnthalpy, Calorimetry, Hess's Law
Enthalpy, Calorimetry, Hess's Law
 
Chemical thermodynamics
Chemical thermodynamicsChemical thermodynamics
Chemical thermodynamics
 
Chemical Reactions: Thermochemistry
Chemical Reactions: ThermochemistryChemical Reactions: Thermochemistry
Chemical Reactions: Thermochemistry
 
Ppt chemical reactions
Ppt chemical reactionsPpt chemical reactions
Ppt chemical reactions
 
Stoichiometry
StoichiometryStoichiometry
Stoichiometry
 
5.4 exothermic and endothermic reactions
5.4 exothermic and endothermic reactions5.4 exothermic and endothermic reactions
5.4 exothermic and endothermic reactions
 

Destacado

Pembahasan Soal2 termokimia
Pembahasan Soal2 termokimiaPembahasan Soal2 termokimia
Pembahasan Soal2 termokimiaNafiah RR
 
NWTC General Chemistry Ch 08
NWTC General Chemistry Ch 08NWTC General Chemistry Ch 08
NWTC General Chemistry Ch 08Steve Sinclair
 
Cotter joint pptx
Cotter joint pptxCotter joint pptx
Cotter joint pptxwaqasme100
 

Destacado (6)

Pembahasan Soal2 termokimia
Pembahasan Soal2 termokimiaPembahasan Soal2 termokimia
Pembahasan Soal2 termokimia
 
Steam tables
Steam tablesSteam tables
Steam tables
 
NWTC General Chemistry Ch 08
NWTC General Chemistry Ch 08NWTC General Chemistry Ch 08
NWTC General Chemistry Ch 08
 
Steam tables
Steam tablesSteam tables
Steam tables
 
Cotter joint pptx
Cotter joint pptxCotter joint pptx
Cotter joint pptx
 
Steam tables
Steam tablesSteam tables
Steam tables
 

Similar a Hess's law

Kimia lecture
Kimia lectureKimia lecture
Kimia lecturenanzor
 
Tang 02 enthalpy and hess' law
Tang 02   enthalpy and hess' lawTang 02   enthalpy and hess' law
Tang 02 enthalpy and hess' lawmrtangextrahelp
 
IB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and CombustionIB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and CombustionLawrence kok
 
g VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docx
g VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docxg VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docx
g VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docxrtodd751
 
IB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and CombustionIB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and CombustionLawrence kok
 
Tang 03 enthalpy of formation and combustion
Tang 03   enthalpy of formation and combustionTang 03   enthalpy of formation and combustion
Tang 03 enthalpy of formation and combustionmrtangextrahelp
 
chem 2045 ch 9 hw.docx
chem 2045 ch 9 hw.docxchem 2045 ch 9 hw.docx
chem 2045 ch 9 hw.docxsdfghj21
 
7-EnthalpyOfReaction
7-EnthalpyOfReaction7-EnthalpyOfReaction
7-EnthalpyOfReactiongenchemlab
 
Lect w10 abbrev_ thermochemistry_alg
Lect w10 abbrev_ thermochemistry_algLect w10 abbrev_ thermochemistry_alg
Lect w10 abbrev_ thermochemistry_algchelss
 
Tang 01b enthalpy, entropy, and gibb's free energy
Tang 01b  enthalpy, entropy, and gibb's free energyTang 01b  enthalpy, entropy, and gibb's free energy
Tang 01b enthalpy, entropy, and gibb's free energymrtangextrahelp
 
Ch6 z5e thermo
Ch6 z5e thermoCh6 z5e thermo
Ch6 z5e thermoblachman
 
Thermodynamics numericl 2016
Thermodynamics numericl 2016Thermodynamics numericl 2016
Thermodynamics numericl 2016nysa tutorial
 

Similar a Hess's law (20)

Kimia lecture
Kimia lectureKimia lecture
Kimia lecture
 
Energetics1
Energetics1Energetics1
Energetics1
 
#23 Key
#23 Key#23 Key
#23 Key
 
Tang 02 enthalpy and hess' law
Tang 02   enthalpy and hess' lawTang 02   enthalpy and hess' law
Tang 02 enthalpy and hess' law
 
IB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and CombustionIB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and Combustion
 
g VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docx
g VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docxg VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docx
g VD Specific Heats ignment-takeCovalentActivity-do-locator-assignment.docx
 
IB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and CombustionIB Chemistry on Hess's Law, Enthalpy Formation and Combustion
IB Chemistry on Hess's Law, Enthalpy Formation and Combustion
 
Tang 03 enthalpy of formation and combustion
Tang 03   enthalpy of formation and combustionTang 03   enthalpy of formation and combustion
Tang 03 enthalpy of formation and combustion
 
For enthalp yrequired
For enthalp yrequiredFor enthalp yrequired
For enthalp yrequired
 
chem 2045 ch 9 hw.docx
chem 2045 ch 9 hw.docxchem 2045 ch 9 hw.docx
chem 2045 ch 9 hw.docx
 
Enthalpy
EnthalpyEnthalpy
Enthalpy
 
Thermochemistry
ThermochemistryThermochemistry
Thermochemistry
 
7-EnthalpyOfReaction
7-EnthalpyOfReaction7-EnthalpyOfReaction
7-EnthalpyOfReaction
 
Lect w10 abbrev_ thermochemistry_alg
Lect w10 abbrev_ thermochemistry_algLect w10 abbrev_ thermochemistry_alg
Lect w10 abbrev_ thermochemistry_alg
 
Tang 01b enthalpy, entropy, and gibb's free energy
Tang 01b  enthalpy, entropy, and gibb's free energyTang 01b  enthalpy, entropy, and gibb's free energy
Tang 01b enthalpy, entropy, and gibb's free energy
 
C H5
C H5C H5
C H5
 
Enthalpy diagram
Enthalpy diagramEnthalpy diagram
Enthalpy diagram
 
#21 Key
#21 Key#21 Key
#21 Key
 
Ch6 z5e thermo
Ch6 z5e thermoCh6 z5e thermo
Ch6 z5e thermo
 
Thermodynamics numericl 2016
Thermodynamics numericl 2016Thermodynamics numericl 2016
Thermodynamics numericl 2016
 

Más de tanzmanj

Stoich ppt
Stoich pptStoich ppt
Stoich ppttanzmanj
 
Limiting reagent do now gram to gram.ppt
Limiting reagent do now gram to gram.pptLimiting reagent do now gram to gram.ppt
Limiting reagent do now gram to gram.ppttanzmanj
 
Do now end of ch 6 im_fs
Do now end of ch 6 im_fsDo now end of ch 6 im_fs
Do now end of ch 6 im_fstanzmanj
 
Thermochemistry ch 16
Thermochemistry ch 16Thermochemistry ch 16
Thermochemistry ch 16tanzmanj
 
Chapter 9 moles, equations, and stoichiometry
Chapter 9 moles, equations, and stoichiometryChapter 9 moles, equations, and stoichiometry
Chapter 9 moles, equations, and stoichiometrytanzmanj
 
Hydrocarbon nomenclature
Hydrocarbon nomenclatureHydrocarbon nomenclature
Hydrocarbon nomenclaturetanzmanj
 
Percent comp_empirical formula_molecular formula
Percent comp_empirical formula_molecular formulaPercent comp_empirical formula_molecular formula
Percent comp_empirical formula_molecular formulatanzmanj
 
Unit 1 - Data Analysis
Unit 1 - Data AnalysisUnit 1 - Data Analysis
Unit 1 - Data Analysistanzmanj
 
Intro acids and bases
Intro acids and basesIntro acids and bases
Intro acids and basestanzmanj
 
Chapter 10 – states of matter
Chapter 10 – states of matterChapter 10 – states of matter
Chapter 10 – states of mattertanzmanj
 
Midterm review 2013
Midterm review 2013Midterm review 2013
Midterm review 2013tanzmanj
 
Ch 8 balancing chemical reactions
Ch 8 balancing chemical reactionsCh 8 balancing chemical reactions
Ch 8 balancing chemical reactionstanzmanj
 
Chapters 6
Chapters 6Chapters 6
Chapters 6tanzmanj
 
Nuclear chem ppt
Nuclear chem pptNuclear chem ppt
Nuclear chem ppttanzmanj
 
Notes hydrocarbon nomenclature-side chains
Notes hydrocarbon nomenclature-side chainsNotes hydrocarbon nomenclature-side chains
Notes hydrocarbon nomenclature-side chainstanzmanj
 
Chapter 14
Chapter 14Chapter 14
Chapter 14tanzmanj
 
Chapter 12 solutions and molarity
Chapter 12  solutions and molarityChapter 12  solutions and molarity
Chapter 12 solutions and molaritytanzmanj
 
Chapter 11 (new)
Chapter 11 (new)Chapter 11 (new)
Chapter 11 (new)tanzmanj
 
Chapter 10 – states of matter
Chapter 10 – states of matterChapter 10 – states of matter
Chapter 10 – states of mattertanzmanj
 

Más de tanzmanj (20)

Stoich ppt
Stoich pptStoich ppt
Stoich ppt
 
Limiting reagent do now gram to gram.ppt
Limiting reagent do now gram to gram.pptLimiting reagent do now gram to gram.ppt
Limiting reagent do now gram to gram.ppt
 
Do now end of ch 6 im_fs
Do now end of ch 6 im_fsDo now end of ch 6 im_fs
Do now end of ch 6 im_fs
 
Thermochemistry ch 16
Thermochemistry ch 16Thermochemistry ch 16
Thermochemistry ch 16
 
Chapter 9 moles, equations, and stoichiometry
Chapter 9 moles, equations, and stoichiometryChapter 9 moles, equations, and stoichiometry
Chapter 9 moles, equations, and stoichiometry
 
Hydrocarbon nomenclature
Hydrocarbon nomenclatureHydrocarbon nomenclature
Hydrocarbon nomenclature
 
Percent comp_empirical formula_molecular formula
Percent comp_empirical formula_molecular formulaPercent comp_empirical formula_molecular formula
Percent comp_empirical formula_molecular formula
 
Unit 1 - Data Analysis
Unit 1 - Data AnalysisUnit 1 - Data Analysis
Unit 1 - Data Analysis
 
Redox
RedoxRedox
Redox
 
Intro acids and bases
Intro acids and basesIntro acids and bases
Intro acids and bases
 
Chapter 10 – states of matter
Chapter 10 – states of matterChapter 10 – states of matter
Chapter 10 – states of matter
 
Midterm review 2013
Midterm review 2013Midterm review 2013
Midterm review 2013
 
Ch 8 balancing chemical reactions
Ch 8 balancing chemical reactionsCh 8 balancing chemical reactions
Ch 8 balancing chemical reactions
 
Chapters 6
Chapters 6Chapters 6
Chapters 6
 
Nuclear chem ppt
Nuclear chem pptNuclear chem ppt
Nuclear chem ppt
 
Notes hydrocarbon nomenclature-side chains
Notes hydrocarbon nomenclature-side chainsNotes hydrocarbon nomenclature-side chains
Notes hydrocarbon nomenclature-side chains
 
Chapter 14
Chapter 14Chapter 14
Chapter 14
 
Chapter 12 solutions and molarity
Chapter 12  solutions and molarityChapter 12  solutions and molarity
Chapter 12 solutions and molarity
 
Chapter 11 (new)
Chapter 11 (new)Chapter 11 (new)
Chapter 11 (new)
 
Chapter 10 – states of matter
Chapter 10 – states of matterChapter 10 – states of matter
Chapter 10 – states of matter
 

Último

UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfUiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfDianaGray10
 
UiPath Studio Web workshop series - Day 7
UiPath Studio Web workshop series - Day 7UiPath Studio Web workshop series - Day 7
UiPath Studio Web workshop series - Day 7DianaGray10
 
Babel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptxBabel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptxYounusS2
 
UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1DianaGray10
 
AI Fame Rush Review – Virtual Influencer Creation In Just Minutes
AI Fame Rush Review – Virtual Influencer Creation In Just MinutesAI Fame Rush Review – Virtual Influencer Creation In Just Minutes
AI Fame Rush Review – Virtual Influencer Creation In Just MinutesMd Hossain Ali
 
Machine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfMachine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfAijun Zhang
 
Bird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystemBird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystemAsko Soukka
 
Introduction to Quantum Computing
Introduction to Quantum ComputingIntroduction to Quantum Computing
Introduction to Quantum ComputingGDSC PJATK
 
UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...
UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...
UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...UbiTrack UK
 
IaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdf
IaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdfIaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdf
IaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdfDaniel Santiago Silva Capera
 
Things you didn't know you can use in your Salesforce
Things you didn't know you can use in your SalesforceThings you didn't know you can use in your Salesforce
Things you didn't know you can use in your SalesforceMartin Humpolec
 
Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024SkyPlanner
 
Basic Building Blocks of Internet of Things.
Basic Building Blocks of Internet of Things.Basic Building Blocks of Internet of Things.
Basic Building Blocks of Internet of Things.YounusS2
 
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationUsing IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationIES VE
 
Secure your environment with UiPath and CyberArk technologies - Session 1
Secure your environment with UiPath and CyberArk technologies - Session 1Secure your environment with UiPath and CyberArk technologies - Session 1
Secure your environment with UiPath and CyberArk technologies - Session 1DianaGray10
 
Spring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdfSpring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdfAnna Loughnan Colquhoun
 
Cybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxCybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxGDSC PJATK
 
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCostKubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCostMatt Ray
 
Nanopower In Semiconductor Industry.pdf
Nanopower  In Semiconductor Industry.pdfNanopower  In Semiconductor Industry.pdf
Nanopower In Semiconductor Industry.pdfPedro Manuel
 
Designing A Time bound resource download URL
Designing A Time bound resource download URLDesigning A Time bound resource download URL
Designing A Time bound resource download URLRuncy Oommen
 

Último (20)

UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfUiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
 
UiPath Studio Web workshop series - Day 7
UiPath Studio Web workshop series - Day 7UiPath Studio Web workshop series - Day 7
UiPath Studio Web workshop series - Day 7
 
Babel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptxBabel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptx
 
UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1
 
AI Fame Rush Review – Virtual Influencer Creation In Just Minutes
AI Fame Rush Review – Virtual Influencer Creation In Just MinutesAI Fame Rush Review – Virtual Influencer Creation In Just Minutes
AI Fame Rush Review – Virtual Influencer Creation In Just Minutes
 
Machine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfMachine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdf
 
Bird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystemBird eye's view on Camunda open source ecosystem
Bird eye's view on Camunda open source ecosystem
 
Introduction to Quantum Computing
Introduction to Quantum ComputingIntroduction to Quantum Computing
Introduction to Quantum Computing
 
UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...
UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...
UWB Technology for Enhanced Indoor and Outdoor Positioning in Physiological M...
 
IaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdf
IaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdfIaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdf
IaC & GitOps in a Nutshell - a FridayInANuthshell Episode.pdf
 
Things you didn't know you can use in your Salesforce
Things you didn't know you can use in your SalesforceThings you didn't know you can use in your Salesforce
Things you didn't know you can use in your Salesforce
 
Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024
 
Basic Building Blocks of Internet of Things.
Basic Building Blocks of Internet of Things.Basic Building Blocks of Internet of Things.
Basic Building Blocks of Internet of Things.
 
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationUsing IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
 
Secure your environment with UiPath and CyberArk technologies - Session 1
Secure your environment with UiPath and CyberArk technologies - Session 1Secure your environment with UiPath and CyberArk technologies - Session 1
Secure your environment with UiPath and CyberArk technologies - Session 1
 
Spring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdfSpring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdf
 
Cybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxCybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptx
 
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCostKubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
KubeConEU24-Monitoring Kubernetes and Cloud Spend with OpenCost
 
Nanopower In Semiconductor Industry.pdf
Nanopower  In Semiconductor Industry.pdfNanopower  In Semiconductor Industry.pdf
Nanopower In Semiconductor Industry.pdf
 
Designing A Time bound resource download URL
Designing A Time bound resource download URLDesigning A Time bound resource download URL
Designing A Time bound resource download URL
 

Hess's law

  • 1. 1 Hess’s Law Start Finish A State Function: Path independent. Both lines accomplished the same result, they went from start to finish. Net result = same.
  • 2. 2 Determine the heat of reaction for the reaction: 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) Using the following sets of reactions: N2(g) + O2(g)  2NO(g) ∆H = 180.6 kJ N2(g) + 3H2(g)  2NH3(g) ∆H = -91.8 kJ 2H2(g) + O2(g)  2H2O(g) ∆H = -483.7 kJ Hint: The three reactions must be algebraically manipulated to sum up to the desired reaction. and.. the ∆H values must be treated accordingly.
  • 3. 3 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) Using the following sets of reactions: N2(g) + O2(g)  2NO(g) ∆H = 180.6 kJ N2(g) + 3H2(g)  2NH3(g) ∆H = -91.8 kJ 2H2(g) + O2(g)  2H2O(g) ∆H = -483.7 kJ Goal: NH3: O2 : NO: H2O: Reverse and x 2 4NH3  2N2 + 6H2 ∆H = +183.6 kJ Found in more than one place, SKIP IT (its hard). x2 2N2 + 2O2  4NO ∆H = 361.2 kJ x3 6H2 + 3O2  6H2O ∆H = -1451.1 kJ
  • 4. 4 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g)Goal: NH3: O2 : NO: H2O: Reverse and x2 4NH3  2N2 + 6H2 ∆H = +183.6 kJ Found in more than one place, SKIP IT. x2 2N2 + 2O2  4NO ∆H = 361.2 kJ x3 6H2 + 3O2  6H2O ∆H = -1451.1 kJ Cancel terms and take sum. 4NH3 + 5O2  4NO + 6H2O ∆H = -906.3 kJ Is the reaction endothermic or exothermic?
  • 5. 5 Determine the heat of reaction for the reaction: C2H4(g) + H2(g)  C2H6(g) Use the following reactions: C2H4(g) + 3O2(g)  2CO2(g) + 2H2O(l) ∆H = -1401 kJ C2H6(g) + 7/2O2(g)  2CO2(g) + 3H2O(l) ∆H = -1550 kJ H2(g) + 1/2O2(g)  H2O(l) ∆H = -286 kJ Consult your neighbor if necessary.
  • 6. 6 Determine the heat of reaction for the reaction: Goal: C2H4(g) + H2(g)  C2H6(g) ∆H = ? Use the following reactions: C2H4(g) + 3O2(g)  2CO2(g) + 2H2O(l) ∆H = -1401 kJ C2H6(g) + 7/2O2(g)  2CO2(g) + 3H2O(l) ∆H = -1550 kJ H2(g) + 1/2O2(g)  H2O(l) ∆H = -286 kJ C2H4(g) :use 1 as is C2H4(g) + 3O2(g)  2CO2(g) + 2H2O(l) ∆H = -1401 kJ H2(g) :# 3 as is H2(g) + 1/2O2(g)  H2O(l) ∆H = -286 kJ C2H6(g) : rev #2 2CO2(g) + 3H2O(l)  C2H6(g) + 7/2O2(g) ∆H = +1550 kJ C2H4(g) + H2(g)  C2H6(g) ∆H = -137 kJ
  • 7. 7 Summary: enthalpy is a state function and is path independent.
  • 8. 8
  • 10. 10 Thermodynamic Quantities of Selected Substances @ 298.15 K