Phechem notes- Work

Work- transfer of energy that makes use of organized motion or stimulates uniform motion of atoms in the surroundings.

General Formula:
Equation 1:

Equation 2:

 Popp= opposing pressure
Pext = external pressure

Equation 2 - Work done by a gas doing expansion or compression against an opposing pressure.

Properties of W:
1.

 - inexact differential:

 meaning less symbol since work is a path function.

Therefore:

 2.


integrates to a finite SUM


3.

 4. Sign convention:

• 
  +, W> 0; dV< 0 (Vf
• -, W< 0; dV> 0 (Vf>Vi); expansion, W is done by the system

5. Units: J; kJ, cal

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