Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
Related questions
Question

Transcribed Image Text:Which of the following best explains why standard enthalpies of formation of compounds
at 25 oC may be either positive or negative?
a) Enthalpies of formation of compounds are relative to a reference concentration of 1M, for
which the enthalpy of formation equals zero. Depending on the compound, formation may either
release energy (in which case the enthalpy of formation will be positive) or absorb energy (in
which case the enthalpy of formation will be negative).
b) Enthalpies of formation of compounds are relative to their elements in standard states, for
which the enthalpy of formation equals zero. Depending on the compound, formation may either
release energy (in which case the enthalpy of formation will be positive) or absorb energy (in
which case the enthalpy of formation will be negative).
c) Enthalpies of formation of compounds are relative to their elements in standard states, for
which the enthalpy of formation equals zero. Depending on the compound, formation may either
release energy (in which case the enthalpy of formation will be negative) or absorb energy (in
which case the enthalpy of formation will be positive).
d) The statement is false – enthalpies of formation of compounds should always be positive
because it always requires energy to break bonds and form compounds from elements.
e) Enthalpies of formation of compounds are relative to a reference concentration of 1M, for
which the enthalpy of formation equals zero.
release energy (in which case the enthalpy of formation will be negative) or absorb energy (in
which case the enthalpy of formation will be positive).
Depending on the compound, formation may either
Expert Solution

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps

Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Recommended textbooks for you

Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning

Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education

Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning

Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning

Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education

Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning

Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education

Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning

Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY