## Equation

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

Leslie Almaraz 4G
Posts: 99
Joined: Fri Aug 02, 2019 12:16 am

### Equation

Can we always replace the q,rev with the change in enthalpy?

Angela Patel 2J
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

### Re: Equation

For calculating delta S, you can substitute qrev for delta H. Remember that this is only true when there is constant pressure.

Leonardo Le Merle 1D
Posts: 56
Joined: Wed Feb 27, 2019 12:16 am

### Re: Equation

What are we meant to use if it is not reversible expansion?

Angela Patel 2J
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

### Re: Equation

Leonardo Le Merle 1D wrote:What are we meant to use if it is not reversible expansion?

You can use the equation S = nRln(v1/v2) if the pressure is not constant.

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