## calculating work

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Aschreck 2G
Posts: 9
Joined: Fri Sep 25, 2015 3:00 am

### calculating work

How does one calculate work of an irreversible system? I'm a bit confused on the difference between reversible/irreversible

jennifer_zhou2C
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

### Re: calculating work

Reversible uses more work. The equation for that is w=-nRTln(V2/V1). For irreversible, use the equation w=P delta V. The pressure of work is the pressure of surroundings.

Chem_Mod
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### Re: calculating work

The above discussion is correct! Just some clarification: reversible work w=-nRTln (V2/V1) is applied in ISOTHERMAL process. For irreversible process, it is w=-P deltaV