U:Internal Energy

[Meachelle_Lum_1I]

What's the difference between
1) deltaU= q+w
and
2) deltaU= deltaH -PV

Is the second equation only for constant pressure? Are there certain circumstances to use each equation or are they interchangeable?

[Toru Fiberesima 1L]

They are essentially the same. It just depends which values you are given in the question, and which you can plug into the equation.

[Julia Lung 1I]

They can both be used to find delta U depending on what's given in the problem. We also went over that when there is no volume change (in most of biology) then delta U = delta H.

[josie 1C]

They are basically the same, you just pick which one you use based on what information you are given in the question.

[chrisavalos-2L]

Essentially they are the same equation you would just use one or the other depending on the information that is given in the problem.