Heat vs. Enthalpy

[006058674]

Hi!
I was wondering what the relationship is between heat and enthalpy. If I read the textbook correctly, it states that heat and enthalpy are the same value at constant pressure.

[Mia Donato]

Heat and enthalpy are related but are not the same thing. Heat is a form of energy. Enthalpy is the amount of heat released or absorbed in a physical change or chemical reaction. Also, enthalpy is a state property whereas heat is not.

[Suraj Kulkarni 2B]

Hi! I completely agree with the previous response. Heat (basically you can think of this as thermal energy in a sense), isn't and shouldn't be always interpreted as enthalpy, since enthalpy more so refers to describing the state of a system itself and the heat released and/or absorbed.

[Vivek Punn 1E]

I agree with everything that the previous two responses have said, I would also like to add that temperature and heat are not the same thing. Once again, heat is not a state property so we can't make claims like heat and enthalpy are the same. Though in many ways they are related, the two are separate concepts that we treat differently in all of these equations. Perhaps one thing that might be confusing is the H in delta H, that DOES NOT stand for heat, enthalpy is NOT the change in heat. heat (or really temperature rather) is a separate thing. Instead with enthalpy we are examining the internal energy of a molecule before and after a reaction. Hope that helps!

[Rachel Lee]

Enthalpy is a state property and heat is not. It's also the measure of how much heat is absorbed or released in a reaction while heat is just energy.

[505685545]

Enthalpy is the state property related to heat. In other words, it measures how much heat is released/absorbed. Although they can be interpreted as the same thing for the purposes of this class, they should be interpreted as different measures.

[Viviana Hsiao 1G]

the relationship between the two is that enthalpy is the amount of heat released/absorbed at a constant pressure. so enthalpy is the state property of heat that is measured at a specific constant pressure.

[Tony Wu 2D]

The difference between enthalpy and heat is that enthalpy describes the amount of heat transferred during a chemical reaction at constant pressure but heat is just a form of energy. Enthalpy is a function of the state, but heat is not.

[HenrikZhang2K]

Enthalpy is a state property, which is the amount of heat absorbed/released in a reaction. Heat on the other hand is one type of energy.

[Jaylin Heggins 1A]

Enthalpy is the amount of heat released or absorbed in a reaction at constant pressure. Heat is being released or absorbed to do the work of the reaction. Enthalpy is a state property and does not depend on the path taken to get to that state. On the other hand, heat is not a state property and depends on the path taken.