Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

19. Chemical Thermodynamics

Gibbs Free Energy Calculations

General Chemistry

19. Chemical Thermodynamics

Gibbs Free Energy Calculations

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Multiple Choice

The dissolution of ammonium nitrate is given by the reaction: NH4NO3(s) -> NH4+(aq) + NO3-(aq). Assuming that the values of ΔH° and ΔS° do not change appreciably with temperature, which of the following is the correct expression to calculate the ΔG° value for the reaction?

ΔG° = TΔS° - ΔH°

ΔG° = ΔH° + TΔS°

ΔG° = ΔH° / TΔS°

ΔG° = ΔH° - TΔS°

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Verified step by step guidance

Understand the Gibbs free energy equation: The Gibbs free energy change (ΔG°) is a thermodynamic quantity that can be calculated using the equation ΔG° = ΔH° - TΔS°, where ΔH° is the change in enthalpy, T is the temperature in Kelvin, and ΔS° is the change in entropy.

Identify the components of the equation: In the equation ΔG° = ΔH° - TΔS°, ΔH° represents the heat absorbed or released during the reaction, T is the absolute temperature, and ΔS° represents the change in disorder or randomness of the system.

Recognize the significance of each term: ΔH° indicates whether the reaction is endothermic or exothermic, TΔS° represents the temperature-dependent change in entropy, and ΔG° determines the spontaneity of the reaction. A negative ΔG° implies a spontaneous process.

Apply the equation to the given reaction: For the dissolution of ammonium nitrate, use the equation ΔG° = ΔH° - TΔS° to calculate the Gibbs free energy change, considering the values of ΔH° and ΔS° provided or assumed constant.

Evaluate the options: Compare the given expressions for calculating ΔG° and identify that the correct expression is ΔG° = ΔH° - TΔS°, as it aligns with the standard Gibbs free energy equation used in thermodynamics.