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: Without referring to a data table, rank the following compounds by standard molar entropy.i) CH3OH (g)ii) O2 (g)iii) N2 (g) 

Solution: Without referring to a data table, rank the following compounds by standard molar entropy.i) CH3OH (g)ii) O2 (g)iii) N2 (g) 

Problem

Without referring to a data table, rank the following compounds by standard molar entropy.

i) CH3OH (g)

ii) O2 (g)

iii) N2 (g) 

Solution

First we look at the phase, noting that gas will have highest entropy, and solid the least entropy. All our compounds are in gas form, next we look at how many elements make up the compound, more elements------> more entropy.  If compounds are made up of same number of elements, we then look at their overall mass. Whichever has the highest molar mass, that's the one that will have the highest entropy.

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