How to Calculate Work in Isothermal Reversible Expansion Using Virial Equation?

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SUMMARY

The discussion focuses on calculating work during isothermal reversible expansion using the virial equation of state. The virial equation is expressed as pVm = RT(1+B/Vm + C/Vm + ...), and the work done is calculated using the formula w = -nRT ln(Vf/Vi). A key point is that the isothermal expansion formula is only applicable to ideal gases, necessitating the use of calculus and the relationship dw = -P dV for accurate calculations.

PREREQUISITES
  • Understanding of the virial equation of state
  • Knowledge of isothermal processes in thermodynamics
  • Familiarity with calculus for integration
  • Concept of molar volume (Vm) and its relation to gas laws
NEXT STEPS
  • Study the derivation and applications of the virial equation of state
  • Learn how to perform calculus-based integrations in thermodynamic contexts
  • Explore the differences between ideal gases and real gases in thermodynamics
  • Investigate the implications of the work done in non-ideal gas expansions
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Students and professionals in thermodynamics, particularly those studying gas behavior and expansion processes, will benefit from this discussion.

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Homework Statement


Calculate the work done during the isothermal reversible expansion of a gas that satisfies the virial equation of state.

Homework Equations


Virial equation of state: pVm = RT(1+B/Vm + C/Vm + ...)

Isothermal reversible expansion: w = -nRT ln(Vf/Vi)

The Attempt at a Solution


I tried to substitute n with the expansion, but that is not correct. Any ideas?

Thanks!
 
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The expression you're using for isothermal reversible expansion is only valid for an ideal gas.

Remember dw=-P dV.

Divide both sides of the virial equation of state by Vm and remember Vm=V/n, then you'll need to use calculus.
 

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