finding -pdeltav using pv=nrt

[905934944]

for a irreverisble reaction, the work done involves temperature change. When we are finding P delta V using P delta V= delta nRT, how do we know which temperature to use? is it the final or initial temperature

[gracetran3d]

You do not need to use pv=nRT to find the P value for the work equation of an irreversible pathway, -pdeltav, since pressure is constant in an irreversible pathway.

[Dylan Do]

For those types of questions, you should use whatever temperature given to you(this temperature could be the final or the initial depending on the situation). I am not aware of any 14B questions that give multiple temperatures.

[Luka Gogorishvili 1K]

PV=nrt does not hold throughout irreversible processes but does throughout reversible ones. To find work in an irreversible process, you can use w=-P(delta V). Here is a quick video for review if you need it: https://youtu.be/sYe0ulf428w.

[Jonathan Choe 3D]

No need to use pvnrt to find the pressure of an irreversible pathway, -pdeltav, since pressure is constant in an irreversible pathway.