Angela Deane

verified

This problem has been solved

100% free to try

Question

What is the difference between $\Delta H$ and $\Delta E_{3}$ ?

   What is the difference between $\Delta H$ and $\Delta E_{3}$ ?

Chemistry

Steven S. Zumdahl,… 8th Edition

Chapter 6, Problem 14

Instant Answer

Solved by Expert Angela Deane

08/20/2019

Step 1

It is a measure of the total energy change in a system, including both internal energy changes and the work done by the system on its surroundings (or vice versa). Show more…

Show all steps

lock

Thanks for your feedback!

What is the difference between $\Delta H$ and $\Delta E_{3}$ ?

Play audio

Feedback

Powered by NumerAI

Angela Deane and 96 other subject Chemistry 102 educators are ready to help you.

Ask a new question

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

Enthalpy Change (?H)

Enthalpy change represents the heat absorbed or released by a system at constant pressure. It is defined as the sum of the change in internal energy and the work done by expansion or contraction (?H = ?E + ?(PV)). This makes ?H particularly useful in processes where pressure is held steady, such as most chemical reactions carried out under atmospheric conditions.

Internal Energy Change (?E)

Internal energy change refers to the total change in the energy contained within a system, including all microscopic forms of energy such as kinetic and potential energy. Unlike ?H, ?E does not include the work associated with pressure-volume changes and thus represents only the net alteration of the system’s energy content.

Pressure-Volume Work

Pressure-volume work is the term that accounts for work performed by or on the system when its volume changes under a constant external pressure. This work is expressed as P?V and is the key factor differentiating ?H from ?E. When a system does work by expanding, additional energy is required, making ?H larger than ?E by the amount of the work done, and vice versa for compression.

Constant Pressure Processes

In many practical and experimental situations, processes occur at constant pressure, which is why the concept of enthalpy is especially relevant. Under constant pressure conditions, the heat exchanged with the surroundings is directly given by ?H rather than ?E, as the latter does not account for the work done due to volume change.

Recommended Videos

Transcript

Ace is your personal tutor. It breaks down any question with clear steps so you can learn.

Start Using Ace