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Ashley McClearnen 1B
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Postby Ashley McClearnen 1B » Tue Feb 12, 2019 11:37 am

Why is the change in internal energy equal to zero when the process is isothermal?

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Re: deltaU=0

Postby Karishma_1G » Tue Feb 12, 2019 11:48 am

Delta U is equal to zero for an isothermal reversible reaction because the heat that is entering the system is equal in magnitude to the work that the system is doing. For example, if -1000 J of work is being done during an isothermal reversible reaction, then 1000 J of heat is entering the system. Therefore, since internal energy = q (heat) + w (work), delta U is equal to zero. Hope that helps!

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Re: deltaU=0

Postby madisondesilva1c » Tue Feb 12, 2019 1:13 pm

Delta U is also 0 when there is no temperature change throughout the process.

Lisa Werner 2F
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Re: deltaU=0

Postby Lisa Werner 2F » Tue Feb 12, 2019 4:22 pm

delta u is 0 when q=-w

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