abcbac said:What is Enthalpy? I mean how is it different than heat. Also Enthalpy= change in energy+pressure*(change in volume). I don't understand where the PV comes into play in this equation.
Enthalpy is a thermodynamic property that describes the total energy of a thermodynamic system. It takes into account both the internal energy of the system and the work required to maintain a constant pressure. It is represented by the symbol H and is measured in units of energy, such as joules or calories.
Enthalpy is important in science because it allows us to understand and analyze the energy changes that occur in chemical and physical processes. This is critical for studying and predicting the behavior of substances and reactions in various conditions, such as temperature and pressure.
Enthalpy is typically calculated by taking the difference between the final and initial energy states of a system, taking into account the work done and the heat added or removed. The formula for calculating enthalpy change is ΔH = Hfinal - Hinitial.
Enthalpy and entropy are both thermodynamic properties, but they measure different aspects of a system. Enthalpy is a measure of the total energy of a system, while entropy is a measure of the disorder or randomness of a system. While enthalpy is typically constant in a closed system, entropy tends to increase.
Enthalpy is used in chemical reactions to determine the energy changes that occur during the reaction. This can help us understand the stability and feasibility of a reaction, as well as predict the direction in which the reaction will proceed. Enthalpy is also used to calculate the heat released or absorbed during a reaction, which is important for practical applications such as designing industrial processes.