(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Okay i feel like i'm going crazy. Here is a sample problem my professor gave me. But I cannot figure out for my life how he got his answer and it hsould be very simple.

A 10.0 mol sample of a perfect gas having Cv = 2.0R undergoes a reversible expanion form 5.00 L to 20.0 L at 5.00 atm of pressure. Calculate q, w, delta U, and delta H for this process..

Solving for work, he has...

w = -PdV = -5(20-5) = -22.5 L atm = -22.8 J

HOW ON EARTH does he get those numbers?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Work, reversible expansion

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