For the process H2 O(l) ⟶H2 O(g) at 298 K and 1.0 atm, ΔH is more positive than ΔE by 2.5 kJ

step 1 So for the process of turning liquid water into water vapor at 298 Kelvin at one atmosphere, the

For the process H2 O(l) ⟶H2 O(g) at 298 K and 1.0 atm, ΔH...

For the process $\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{H}_{2} \mathrm{O}(g)$ at $298 \mathrm{~K}$ and $1.0 \mathrm{~atm}, \Delta H$ is more positive than $\Delta E$ by $2.5 \mathrm{~kJ} / \mathrm{mol}$. What does the $2.5 \mathrm{~kJ} / \mathrm{mol}$ ouantity renresent?

For the process $\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{H}_{2} \mathrm{O}(g)$ at $298 \mathrm{~K}$ and $1.0 \mathrm{~atm}, \Delta H$
is more positive than $\Delta E$ by $2.5 \mathrm{~kJ} / \mathrm{mol}$. What does the $2.5 \mathrm{~kJ} / \mathrm{mol}$ ouantity renresent?

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Pressure-Volume Work

Pressure-volume work refers to the energy transferred by a system to its surroundings when it expands or contracts at constant pressure. In processes like vaporization, the system must do work against the external pressure to increase its volume. The difference between the enthalpy change and the internal energy change (?H - ?E) quantifies this work, indicating the energy required to overcome the surrounding atmospheric pressure during the phase change.

Internal Energy

Internal energy is the energy associated with the microscopic components of a system, such as the kinetic and potential energies of molecules. Unlike enthalpy, internal energy does not include the energy required to perform work on the system’s environment. Therefore, changes in internal energy (?E) reflect only the heat and work interactions that affect the system’s internal structure.

Enthalpy

Enthalpy is a thermodynamic state function that represents the total heat content of a system. It includes both the internal energy of the system and the energy required to make room for it by displacing its surroundings, often referred to as pressure-volume work. In processes occurring at constant pressure, the change in enthalpy (?H) encompasses not only the change in internal energy but also the energy used for expansion or compression work.

Transcript

Please give Ace some feedback