## Formula Manipulations

$\Delta U=q+w$

104969854
Posts: 36
Joined: Fri Sep 29, 2017 7:05 am

### Formula Manipulations

I was given a "cheat sheet" in one of my peer learning sessions that went over ways to manipulate equations for each given situation. One of the equations say that at constant pressure, ndeltaH=q...but I'm just confused how this applies. I always think to use MCAT to solve heat? I was also told that q=deltaU at constant volume. But doesn't deltaU=DeltaH at constant volume as well? Will heat, internal energy, AND enthaly be equal at constant volume?

Will someone explain how these equations got derived and where they came from? In which situations will they apply?

vicenteruelos3
Posts: 42
Joined: Fri Sep 29, 2017 7:07 am

### Re: Formula Manipulations

q is equal to deltaU at constant volume becuase delta u = q plus w, so at constant volume there is no expansionary work (w=0)