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Homework posted in wrong forum, so no template

Hello

I am confused with the energy conservation equation in thermodynamics.

Is it U2 - U1 = Q - W ? This is what most books say.

Or is it H2 - H1 = Q - W ?

Which should I use to solve problems? For example we have a gas with U1 and P1V1 (which makes H1). After a process, we have Q transferred in or out and W transferred in or out. How can I write the equation in this situation?

Thanks

I am confused with the energy conservation equation in thermodynamics.

Is it U2 - U1 = Q - W ? This is what most books say.

Or is it H2 - H1 = Q - W ?

Which should I use to solve problems? For example we have a gas with U1 and P1V1 (which makes H1). After a process, we have Q transferred in or out and W transferred in or out. How can I write the equation in this situation?

Thanks