Αποτελέσματα Αναζήτησης
13 Μαΐ 2023 · Heat flow measurements can be made with either a constant-pressure calorimeter, which gives \(ΔH\) values directly, or a bomb calorimeter, which operates at constant volume and is particularly useful for measuring enthalpies of combustion.
- 5.3: Enthalpy
Enthalpy is a state function whose change indicates the...
- 5.3: Enthalpy
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.
The enthalpy of an ideal gas is independent of its pressure or volume, and depends only on its temperature, which correlates to its thermal energy. Real gases at common temperatures and pressures often closely approximate this behavior, which simplifies practical thermodynamic design and analysis.
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.
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.
Enthalpy changes and phase changes. Measuring enthalpy changes by calorimetry. Hess’s law of constant heat formation. Chemical standards and standard states. Standard enthalpies of formation, ionic enthalpies and bond energies. How the change in enthalpy varies with temperature. Kirchhoff’s equations.
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.
