Enthalpy and Internal Energy

[Azlyn Hernandez 2E]

Whats the difference between delta H and Delta U?

[106052916]

One is the change in internal energy thats dependent on work and heat while the other is heat absorbed or given off by a system. They're very similar but in most cases enthalpy is given to you for a reaction on a table.

[Deep Mehta]

Delta H is equal to qp (constant pressure). Delta U on the other hand is q + w, with expansion work taken into account along with delta H.

[105561735]

It gets confusing since delta h and delta u both represent changes in energy, but they differ in their definitions, associated conditions (Pressure for delta H and Volume for delta U) and types of energy change they encompass

[Emily An 1L]

∆H is the enthalpy change in a system and the unit is joules or kilojoules. U is the internal energy of a system refers to the addition of kinetic and potential energy of that particular system and ∆U is the change in internal energy

[106062642]

Under constant pressure, ΔH represents the change in a system's enthalpy, and ΔU represents the change in a system's internal energy. Although they account for different parts of the system's energy, ΔH and ΔU are both essential concepts in thermodynamics that are used to quantify energy changes during chemical reactions and physical processes.

[Isabelle Huerta 2I]

The main thing when determining the difference between ∆H and ∆U is what they're looking for and what they bring to the system's energy. ∆H is referring to the heat that is being transferred in/out of a system when pressure is a constant (∆P = 0). This value takes into account the internal energy and any work done on/by the system. Now ∆U is only focused on the change of internal energy on the system, regardless of pressure, volume, or work being done/by the system.

[Charlotte Norris 2K]

delta U represents the change in internal energy while delta h represents the change in the total heat of a system.

[Chris_1234]

ΔH measures the heat exchanged during a reaction at constant pressure, while ΔU measures the change in internal energy during a reaction with no change in volume. ΔH is associated with reactions happening in open containers. ΔU is linked to reactions occurring in closed containers, where volume remains constant, like in a bomb calorimeter.