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26 Αυγ 2023 · Define enthalpy and explain its classification as a state function. Write and balance thermochemical equations. Calculate enthalpy changes for various chemical reactions. Explain Hess’s law and use it to compute reaction enthalpies.
Enthalpy is a state function whose change indicates the amount of heat transferred from a system to its surroundings or vice versa, at constant pressure. The change in the internal energy of a system is the sum of the heat transferred and the work done.
30 Ιαν 2023 · The heat that passes into or out of the system during a reaction is the enthalpy change. Whether the enthalpy of the system increases (i.e. when energy is added) or decreases (because energy is given off) is a crucial factor that determines whether a reaction can happen.
The change in enthalpy (Δ H °) is the energy supplied as a heat at a constant pressure when commonly the system does no extra work, and it is determined with a calorimeter by measuring the change in temperature at a constant pressure (Atkins and Paula, 2009).
Learning Objectives. By the end of this section, you will be able to: State the first law of thermodynamics. Define enthalpy and explain its classification as a state function. Write and balance thermochemical equations. Calculate enthalpy changes for various chemical reactions. Explain Hess’s law and use it to compute reaction enthalpies.
4 Ιουν 2019 · The change in enthalpy of a chemical reaction conducted at constant pressure is equal to the heat of the reaction plus the nonexpansion work of the reaction, Δ H = qP + wadditional.
