Ch.6 - Thermochemistry WorksheetSee 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: At constant pressure, which of these systems do work on the surroundings? A. 2A(g) + 3B(g) → 4C(g)B. A(s) + B(s) → C(g)C. 2A(g) + 2B(g) → 3C(g)D. 2A(g) +B(g) → 4C(g)E. More than one of the above 

Solution: At constant pressure, which of these systems do work on the surroundings? A. 2A(g) + 3B(g) → 4C(g)B. A(s) + B(s) → C(g)C. 2A(g) + 2B(g) → 3C(g)D. 2A(g) +B(g) → 4C(g)E. More than one of the above 

Problem

At constant pressure, which of these systems do work on the surroundings? 

A. 2A(g) + 3B(g) → 4C(g)

B. A(s) + B(s) → C(g)

C. 2A(g) + 2B(g) → 3C(g)

D. 2A(g) +B(g) → 4C(g)

E. More than one of the above 

Solution

Recall: When the system does work on the surroundings, the sign for work (w) is negative (w <  0). On the other hand, work is positive (w > 0) if the surroundings do work on the system. To illustrate

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