## Adiabatic Expansion of an Ideal Gas

$\Delta S = \frac{q_{rev}}{T}$

Connie2I
Posts: 29
Joined: Fri Sep 29, 2017 7:07 am

### Adiabatic Expansion of an Ideal Gas

In a problem, how do we know to use the equation for calculating entropy of adiabatic expansion of an Ideal Gas, in other words, using delta S = nRln(V(final) - V(Initial))?
Will the problem just state if the system is adiabatic or are there any more key words to be aware of?

Tanaisha Italia 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

### Re: Adiabatic Expansion of an Ideal Gas

Other words/phrases could be "assume ideal gas behavior", "the volume changes to/the final volume is", and "what is the change in entropy after the change in volume". It could also say adiabatic, but most problems of this type would refer to a change in volume and have you calculate the change in entropy after giving you initial and final volumes.