Thermodynamics - Enthalpy(H) Formula_ What is the Pressure Volume Product - Chemistry Stack Exchange

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sign up log in tour help Take the 2-minute tour × Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers and students. It's 100% free, no registration required. Enthalpy(H) formula: what is the pressure volume product Above is the formula for enthalpy- or, the sum of the internal energy and pressure volume product. is work done by or on the system. But , yet very similar to work, I think, calculates the whole"cylinder". Instead of just calculating the height difference of the cylinder before and after the air is condensed, it calculate the height of whole cylinder. But anyway this is just my guess, what is it really? thermodynamics edited Nov 3 at 4:53 Jason Patterson 1,473 9 asked Nov 2 at 20:31 Doeser 55 4 – When you consider a change in enthalpy at constant pressure, the PV term becomes and it and work (from the change in energy) cancel exactly. Jason Patterson Nov 3 at 4:55 1 Answer The U term can be interpreted as the energy required to create the system, and the pV term as the energy that would be required to "make room" for the system if the pressure of the environment remained constant. When a system, for example, n moles of a gas of volume V at pressure p and temperature T, is created or brought to its present state from absolute zero, energy must be supplied equal to its internal energy U plus pV, where pV is the work done in pushing against the ambient (atmospheric) pressure. answered Nov 3 at 4:54 eaxdpiotnyeantial 853 25

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    Enthalpy(H) formula: what is the pressure volume product

    Above is the formula for enthalpy- or, the sum of the internal energy and pressure volume product.

    is work done by or on the system. But , yet very similar to work, I think, calculates the whole"cylinder". Instead of just calculatingthe height difference of the cylinder before and after the air is condensed, it calculate the height of whole cylinder.

    But anyway this is just my guess, what is it really?

    thermodynamics

    edited Nov 3 at 4:53Jason Patterson1,473 9

    asked Nov 2 at 20:31Doeser55 4

    When you consider a change in enthalpy at constant pressure, the PV term becomes and it and work (fromthe change in energy) cancel exactly.

    Jason Patterson Nov 3 at 4:55

    1 Answer

    The U term can be interpreted as the energy required to create the system, and the pV term as theenergy that would be required to "make room" for the system if the pressure of the environmentremained constant. When a system, for example, n moles of a gas of volume V at pressure p andtemperature T, is created or brought to its present state from absolute zero, energy must besupplied equal to its internal energy U plus pV, where pV is the work done in pushing against theambient (atmospheric) pressure.

    answered Nov 3 at 4:54eaxdpiotnyeantial853 25


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