18.4 Delta G, Delta H, Delta S and Formation Reactions

Chad's General Chemistry Videos

Chapter 1 – Matter and Measurement
- 1.1 Matter
- 1.2 Significant Figures
- 1.3 Units and Conversions
Chapter 2 – Atoms, Molecules, and Ions
- 2.1 Atomic Structure and Introduction to the Periodic Table
- 2.2 Naming Ionic Compounds
- 2.3 Naming Molecular Compounds
- 2.4 Naming Acids
Chapter 3 – Stoichiometry
- 3.1 Chemical Reactions & Chemical Equations
- 3.2 Calculations With Moles
- 3.3 Mass Percent and Empirical and Molecular Formulas
- 3.4 Limiting Reagent Calculations
Chapter 4 – Aqueous Reactions and Solution Stoichiometry
- 4.1 Solutions and Electrolytes
- 4.2 Double Displacement Reactions
- 4.3 Oxidation-Reduction Reactions
- 4.4 Molarity and Dilutions
- 4.5 Solution Stoichiometry
Chapter 5 – Thermochemistry
- 5.1 First Law of Thermodynamics and Enthalpy
- 5.2 Calorimetry
- 5.3 Hess’s Law and Enthalpies of Formation
Chapter 6 – Electronic Structure
- 6.1 Nature of Light and the Photoelectric Effect
- 6.2 Electronic Transitions (Absorption and Emission)
- 6.3 The de Broglie Relation and the Heisenberg Uncertainty Principle
- 6.4 Quantum Numbers and Atomic Orbitals
- 6.5 Electronic Configuration
Chapter 7 – Periodic Trends
- 7.1 Atomic Radius
- 7.2 Ionization Energy
- 7.3 Electron Affinity & Electronegativity
- 7.4 Properties of Elements & Compounds
Chapter 8 – Bonding and Lewis Structures
- 8.1 Bonding and Lattice Energy
- 8.2 Lewis Dot Structures
- 8.3 Bond Enthalpies
Chapter 9 – Molecular Geometry
- 9.1 VSEPR Theory and Molecular Geometry
- 9.2 Hybridization
- 9.3 Polarity
- 9.4 Sigma and Pi Bonds
- 9.5 Molecular Orbital Theory
Chapter 10 – Gases
- 10.1 Properties of Gases and the Ideal Gas Law
- 10.2 Gas Laws
- 10.3 Partial Pressures, Density, and the Volume of Ideal Gases at STP
- 10.4 Graham’s Law of Effusion and Real Gases
Chapter 11 – Liquids and Solids
- 11.1 Intermolecular Forces
- 11.2 Phase Diagrams
Chapter 13 – Solutions
- 13.1 Introduction to Colligative Properties, the van’t Hoff factor, and Molality
- 13.2 Calculations Involving Freezing Point Depression and Boiling Point Elevation
- 13.3 Vapor Pressure Depression and Raoult’s Law
- 13.4 Osmotic Pressure
Chapter 14 – Kinetics
- 14.1 Rates and Rate Expressions
- 14.2 Rate Laws
- 14.3 Mechanisms, Catalysts, and Reaction Coordinate Diagrams
- 14.4 Collision Theory and the Arrhenius Equation
- 14.5 Integrated Rate Laws and Half Lives
Chapter 15 – Equilibrium
- 15.1 Equilibrium and Equilibrium Constants
- 15.2 Le Chatelier’s Principle
- 15.3 Equilibrium Calculations
Chapter 16 – Acids and Bases
- 16.1 Introduction to Acids and Bases
- 16.2 Introduction to the pH Scale and pH Calculations
- 16.3 pH Calculations for Strong Acids and Bases
- 16.4 pH Calculations for Weak Acids and Bases
- 16.5 Acidity and Basicity of Salts
Chapter 17 – Buffers, Titrations, and Solubility
- 17.1 Buffers
- 17.2 Titrations and Titration Curves
- 17.3 pH Calculations Involving Titrations
- 17.4 Solubility and Ksp
- 17.5 The Common Ion Effect and Precipitation
- 17.6 pH Effects on Solubility
Chapter 18 – Thermodynamics
- 18.1 The Laws of Thermodynamics
- 18.2 Entropy
- 18.3 Gibbs Free Energy | Delta G = Delta H – T Delta S
- 18.4 Delta G, Delta H, Delta S and Formation Reactions
- 18.5 Gibbs Free Energy and the Equilibrium Constant
Chapter 19 – Electrochemistry
- 19.1 Oxidation Reduction Reactions and Oxidation States
- 19.2 Balancing Oxidation Reduction Reactions
- 19.3 Galvanic Cells
- 19.4 Standard Cell Potentials aka emf or Voltage
- 19.5 Nonstandard Cell Potentials the Nernst Equation
- 19.6 Reduction Potentials and the Relationship between Cell Potential, Delta G, and the Equilibrium Constant
- 19.7 Electrolytic Cells
- 19.8 Electrolysis Calculations
Chapter 20 – Nuclear Chemistry
- 20.1 Introduction to Nuclear Chemistry and Trends in Radioactivity
- 20.2 Balancing Nuclear Reactions
- 20.3 Routes of Nuclear Decay, Fission, and Fusion
- 20.4 Kinetics of Nuclear Decay
- 20.5 Energy of Nuclear Reactions and Nuclear Binding Energy
Chapter 21 – Coordination Chemistry
- 21.1 Introduction to Coordination Chemistry
- 21.2 Nomenclature of Complex Ions and Coordination Compounds
- 21.3 Isomers
- 21.4 Review of Electronic Configurations
- 21.5 Crystal Field Theory
- 21.6 Color
- 21.7 Magnetism

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Calculating ΔG⁰ and ΔH⁰ from Formation Reactions

ΔG⁰_rxn = ΣnΔG_f,products - ΣmΔG_f,reactants

ΔH⁰_rxn = ΣnΔH_f,products - ΣmΔH_f,reactants

Calculating ΔS⁰ from Absolute Entropies

ΔS⁰_rxn = ΣnS_products - ΣmS_reactants