Ch. 17 - Chemical ThermodynamicsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Among the many complex ions of cobalt are the following:Co(NH3)63+(aq) + 3en(aq) ⥫⥬ Co(en)33+(aq) + 6NH3(aq)where “en” stands for ethylenediamine, H2NCH2CH2NH2. Six Co—N bonds are broken and six Co—N bonds are formed in this reaction, so ΔH°rxn ≈ 0; yet K > 1. What are the signs of ΔS° and ΔG°? What drives the reaction?

Problem

Among the many complex ions of cobalt are the following:

Co(NH3)63+(aq) + 3en(aq) ⥫⥬ Co(en)33+(aq) + 6NH3(aq)

where “en” stands for ethylenediamine, H2NCH2CH2NH2. Six Co—N bonds are broken and six Co—N bonds are formed in this reaction, so ΔH°rxn ≈ 0; yet K > 1. What are the signs of ΔS° and ΔG°? What drives the reaction?