thermodynamics equation

[Maribel 1E]

I was just looking at the equation change of U = q + w. I then saw that under constant pressure, this could be changed to change in U = change in H - P change in V. Can someone explain again the steps to get there? I just do not understand why and how q = change in H.

[ElizabethTopalian 2K]

q= delta H because, delta H is the amount of heat released or absorbed at constant pressure, and q is the net heat transferred into the system, so they could be used interchangeably when the non compression work by the system is zero.

[Maya_Panozzo_2D]

In an equation used in one of Lavalle's examples from his lecture he used q=g(grams)*Csp*change in T. Does anyone know what the sp stands for? I'm pretty sure the C stands for constant.

[Titania Le [2F]]

In an equation used in one of Lavalle's examples from his lecture he used q=g(grams)*Csp*change in T. Does anyone know what the sp stands for? I'm pretty sure the C stands for constant.

The sp stands for specific! So in that example, he is referring to the specific heat capacity. :)