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Kristina Rizo 2K
Posts: 105
Joined: Wed Sep 18, 2019 12:19 am


Postby Kristina Rizo 2K » Thu Feb 06, 2020 9:18 pm

The question asks to calculate the work for an irreversible expansion against a constant external pressure of 1.00atm to find the final volume of 6.52L. I used the equation w=Pex * delta V and got -2.23L atm, but the answer is 226 and in the SSM it multiplied the -2.23L atm by 101.325. Does anyone know where this number comes from? Is it a constant I am supposed to know?

Michael Nguyen 1E
Posts: 120
Joined: Sat Aug 17, 2019 12:17 am

Re: 4B.13a

Postby Michael Nguyen 1E » Thu Feb 06, 2020 9:31 pm

This constant is used to convert between L*atm and Joules. It can be found on the provided constants & equations sheet.

Posts: 50
Joined: Mon Nov 11, 2019 12:17 am

Re: 4B.13a

Postby 205291012 » Thu Feb 06, 2020 9:50 pm

The constant is important because the final unit of work done must be in Joules not in L*atm.

Matthew Chan 1B
Posts: 111
Joined: Sat Sep 07, 2019 12:16 am

Re: 4B.13a

Postby Matthew Chan 1B » Sun Feb 09, 2020 6:33 pm

Hey! The 101.325 J value is just a conversion that we should know. I think it's just good to memorize it as it's definitely important, since we measure work in joules and not L.atm!

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