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Determination of the enthalpy of vaporisation of liquids with Cobra4

Determination of the enthalpy of vaporisation of liquids with Cobra4

Item no.: P3020461

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Principle

The vaporisation of a liquid occurs with heat absorption. To determine the enthalpy of vaporisation, a known mass of the liquid which is to be investigated is vaporised in a special vaporisation vessel in a current of air. The quantity of heat absorbed, which corresponds to the enthalpy of vaporisation, can be calorimetrically determined.

Tasks

  1. Determine the molar enthalpy of vaporisation of diethyl ether and methanol.
  2. Calculate the molar entropies of vaporisation and discuss the results under consideration of Trouton's rule.

What you can learn about

  • Enthalpy of vaporisation
  • Enthalpy of condensation
  • Enthalpy of sublimation
  • Vapour pressure
  • Entropy of vaporisation
  • Clausius-Clapeyron equation
  • Trouton's rule
  • Law of thermodynamics
  • Calorimetry

Necessary accessories

  • Precision balance 620g/0.001g
  • Precision balance 6200g/0.01g

Software included. Computer not provided.

Document     Filesize
p3020461e.pdf Experiment guide, English 356.62 KB

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