객관식
Which of the following represents the standard heat of formation reaction for sodium chloride (NaCl) in its solid form?
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8. Thermochemistry
Thermochemical Equations
객관식
Which statement correctly describes the relationship between the enthalpy of vaporization and the enthalpy of condensation for a substance?
A
The enthalpy of condensation and vaporization are identical in both magnitude and sign.
B
The enthalpy of condensation is unrelated to the enthalpy of vaporization.
C
The enthalpy of condensation is equal in magnitude but opposite in sign to the enthalpy of vaporization.
D
The enthalpy of condensation is always greater than the enthalpy of vaporization.
검증된 단계별 안내1
Understand that enthalpy changes (\( \Delta H \)) represent the heat absorbed or released during a process at constant pressure.
Recall that vaporization is the process of a liquid turning into a gas, which requires energy input, so the enthalpy of vaporization (\( \Delta H_{vap} \)) is positive.
Recognize that condensation is the reverse process, where a gas turns into a liquid, releasing energy, so the enthalpy of condensation (\( \Delta H_{cond} \)) is negative.
Since condensation is the exact reverse of vaporization, the magnitude of the enthalpy change is the same, but the sign is opposite, meaning \( \Delta H_{cond} = - \Delta H_{vap} \).
Therefore, the correct relationship is that the enthalpy of condensation is equal in magnitude but opposite in sign to the enthalpy of vaporization.
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