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Adding on to what was said above, in constant pressure systems, we typically have to account for expansion work, but in constant volume systems, we don't (the gas can't expand if there's no volume change). Hope this helps!
Alondra wrote:Constant pressure: for monatomic it’s 5R/2; for diatomic it’s 7R/2
Constant volume: for monatomic it’s 3R/2; for diatomic it’s 5R/2
I addition to this, Organic Chemistry tutor has an entire video dedicated to this topic.
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