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Which of the following best explains why standard enthalpies of formation of compounds at 25 oC may be either positive or negative?

Which of the following best explains why standard enthalpies of formation of compounds at 25 oC may be either positive or negative?

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.101PAE
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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
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
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