Examples of enthalpy in the following topics:
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- shows the different states of matter and how they can change from one to another as a function of enthalpy and pressure and temperature changes.
- A solid can change to a liquid with an enthalpy increase.
- A liquid can change into a gas when it hits its boiling point or can even enter a plasma state if the enthalpy is increased enough.
- When the enthalpy is lowered, a liquid can transform into a solid through freezing.
- This figure illustrates the relationship between the enthalpy of a system and the state of matter that the system is in.
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- Dividing the energy change by how many grams (or moles) of A were present gives its enthalpy change of reaction.
- A constant-pressure calorimeter measures the change in enthalpy of a reaction occurring in solution during which the atmospheric pressure remains constant.
- where Cp is the specific heat at constant pressure, ΔH is the enthalpy of the solution, ΔT is the change in temperature, W is the mass of the solute, and M is the molecular mass of the solute.
- Constant-pressure calorimetry is used in determining the changes in enthalpy occurring in solution.
- Under these conditions the change in enthalpy equals the heat (Q=ΔH).
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- Here w is the enthalpy per unit volume whereas in previous sections it denoted the enthalpy per unit mass, wmass=wvolumeV.
- The first term cancels in the previous equation, leaving the middle term which equals twice the enthalpy per unit mass.
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- where w=(ϵ+P)/ρ is the heat function (enthalpy) per unit mass of the fluid.
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- With the enthalpy of the system given by
- Explain the enthalpy in a system with constant volume and pressure
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- The lower curve a is the shock adiabat without the chemical changes and a′ is the detonation abiabat which uses the functional form of the enthalpy in the burnt gas.
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- However, the enthalpy of an isothermal gas is given by
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- We can use the definition of the enthalpy to eliminate it from the equations
- Because the specific enthalpy (p1,V1) iPs a function of P and Vw=γ/(γ−1)pV, the eighteenth equation in this section defines a curve.
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- where w is the enthalpy per unit mass.