How Enthalpy is defined?

Enthalpy

Definition: Enthalpy is a measure of the total internal energy of a system, including both kinetic and potential energy, whereas entropy is a measure of the disorder or randomness of a system.

Unit of measurement

Enthalpy is typically measured in units of joules (J) or calories (cal), while entropy is typically measured in units of joules per kelvin (J/K).

Role in thermodynamics 

 Enthalpy is a fundamental concept in thermodynamics and is often used to describe heat transfer in a system. Entropy, on the other hand, is a measure of the availability of energy in a system to do work and is used to describe the disorder or randomness of a system.

Sign: 

Enthalpy is a state function, meaning that it depends only on the initial and final states of a system, not on the path taken to get there. The change in enthalpy of a system is positive if heat is absorbed by the system, and negative if heat is released by the system. Entropy is also a state function, and the change in entropy of a system is positive if the system becomes more disordered, and negative if the system becomes more ordered.

Relationship to energy: 

Enthalpy is a measure of the total energy of a system, including both kinetic and potential energy. Entropy, on the other hand, is not directly related to energy, but rather to the availability of energy to do work.

Applications:

Enthalpy is commonly used in chemical reactions to predict the heat transfer that will occur. Entropy is important in the study of thermodynamics and is used to predict the behavior of systems at equilibrium. 

Frequently Asked Questions (FAQs) 

Q: What does ΔH mean in chemistry?

ΔH is a measure of the enthalpy change of a chemical reaction, and it is a useful tool for predicting the spontaneity of a reaction.

Q: Is ΔH positive or negative?

ΔH is negative for exothermic reactions and positive for endothermic reactions. It is important to note that the enthalpy change of a reaction is a state function, which means that it is independent of the path taken to reach the final state.

Q: What is entropy vs enthalpy?

 entropy is a measure of the degree of disorder or randomness in a system, while enthalpy is a measure of the heat content of a system. Both entropy and enthalpy are important thermodynamic properties that are used to describe the behavior of chemical systems.

Q: What is entropy in real life?

 entropy can be observed in many different systems in real life, including through the process of diffusion and the transfer of heat. It is an important concept that helps to explain the behavior of systems in the real world.

Q: Is enthalpy equal to heat?

heat is a form of energy that is transferred between systems due to a temperature difference, while enthalpy is a measure of the heat content of a system. They are related, but they are not exactly the same thing.

Let me know if you have more questions or if there is a specific topic that you would like to know more about.