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Jeann25
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I need to find the enthalpy for H3O. I can't find it in my table in my book, and I'm not having much luck finding it online. Is there one for this molecule? 
Jeann25 said:
Enthalpy is a thermodynamic property that describes the total amount of energy in a system, including both its internal energy and the energy required to maintain its constant pressure and volume. It is usually represented by the symbol H and measured in units of energy per mole (J/mol).
Enthalpy is important in chemistry because it allows us to understand and predict the behavior of chemical reactions. It helps us determine the energy changes that occur during a reaction, which can help us determine the feasibility and direction of a reaction.
To find the enthalpy for H3O (hydronium ion), you can use the formula H = U + PV, where H is enthalpy, U is internal energy, P is pressure, and V is volume. You will need to know the internal energy and volume of the system in order to calculate the enthalpy. Additionally, you can use enthalpy tables or perform experiments to determine the enthalpy of a specific reaction.
The enthalpy of a system can be affected by changes in temperature, pressure, and the number and types of molecules present. It can also be influenced by the physical state of the substances involved (i.e. solid, liquid, gas) and the presence of any catalysts or inhibitors.
Enthalpy and internal energy are closely related, but they are not the same. Internal energy refers to the total energy of a system, including both its kinetic and potential energy. Enthalpy, on the other hand, takes into account the energy required to maintain constant pressure and volume. In other words, enthalpy includes the work done by a system as it expands or contracts, whereas internal energy does not.