Multiple Choice
For which of the following reactions does ΔH_{rxn} represent an enthalpy of formation?
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8. Thermochemistry
Enthalpy of Formation
Multiple Choice
Which term describes the overall energy change that occurs during the formation of a solution from its constituent substances?
A
Enthalpy of solution (ΔH_{solution})
B
Enthalpy of vaporization (ΔH_{vap})
C
Enthalpy of formation (ΔH_{f})
D
Enthalpy of fusion (ΔH_{fus})
Verified step by step guidance1
Understand that the problem asks for the term describing the overall energy change when a solution forms from its pure components.
Recall that the enthalpy of solution (\$\(\Delta\) H_{solution}\$) refers to the heat absorbed or released when a solute dissolves in a solvent to form a solution.
Recognize that enthalpy of vaporization (\$\(\Delta\) H_{vap}\$) is the energy required to convert a liquid into a gas, which is unrelated to solution formation.
Know that enthalpy of formation (\$\(\Delta\) H_{f}\$) is the energy change when one mole of a compound forms from its elements in their standard states, not specifically about solutions.
Remember that enthalpy of fusion (\$\(\Delta\) H_{fus}\$) is the energy change when a solid melts to a liquid, also unrelated to solution formation.
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