## ΔU = 0?

$\Delta U=q+w$

Arman M 1A
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### ΔU = 0?

If ΔU = 0, does that always mean that the process is isothermal? If so, why?

Amy Lefley 1J
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

### Re: ΔU = 0?

Yes, since deltaU is equal to 3/2nRT, if deltaU is zero then T must be zero and the pathway is isothermal.

Cameron_Greenberg_3C
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

### Re: ΔU = 0?

In addition, reversible and isothermal for our purposes in 14B can be considered synonyms. So any reaction that is reversible is therefore isothermal, and vice versa. These reactions have a (delta)U of 0.

Jasmine Chow 1F
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### Re: ΔU = 0?

Usually for isothermal delta U is zero. This is because if the equation from the first law of thermodynamics. 3/2nRT, when T equal zero delta U will be zero.

Danny Zhang 4L
Posts: 62
Joined: Fri Sep 28, 2018 12:26 am

### Re: ΔU = 0?

Delta U=0 assumes an isothermal process because of delta U=(3/2)nR(delta T). When delta U is zero, delta T will have to be zero as well for the equation to be true.