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: A process is carried out on a system at  constant external pressure. During the process 150. J of heat moves from the surroundings to the system, and the system expands, performing 400.J of work. The

Solution: A process is carried out on a system at  constant external pressure. During the process 150. J of heat moves from the surroundings to the system, and the system expands, performing 400.J of work. The

Problem

A process is carried out on a system at  constant external pressure. During the process 150. J of heat moves from the surroundings to the system, and the system expands, performing 400.J of work. The values for q, w, ΔU, and ΔH for the process are:

a. q = -150.J, w = 400.J, ΔU = 250.J, ΔH = -150.J

b. q = 150.J, w = 400.J, ΔU = 550.J, ΔH = 550.J

c. q = 150.J, w = 400.J, ΔU = 550.J, ΔH = 150.J

d. q = 150.J, w = -400.J, ΔU = -250.J, ΔH = -250.J

e. q = 150.J, w = -400.J, ΔU = -250.J, ΔH = 150.J

 

Solution

We are being asked to identify ΔU or internal energy, heat (q), work (w) and enthalpy (ΔH). The internal energy (ΔE or ΔU) of a system can be calculated from the heat and work of the system. The relationship between internal energy, heat, and work is shown in the following equation:

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