8.49

[donnanguyen1d]

in chapter 8 problem 49, how did you know the temperature to calculate work was 298K? and why was there a negative sign ?

[Kelly Seto 2J]

I think if there is no temperature explicitly stated, 298 K is just the standard temperature used in thermodynamics

[Alexandria Weinberger]

The textbook stated that all temperatures will be assumed to be 298 K unless stated otherwise because that is standard.

[Michael Cheng 1C]

What is the difference between internal energy and enthalpy?

[Brandon Fujii 1K]

We use 298K for the standard temperature for thermodynamics because 298K = 25C which is room temperature

[Cooper1C]

What is the difference between internal energy and enthalpy?

H = U + PV. Enthalpy is equal to internal energy plus the product of pressure and volume, so internal energy is included in the enthalpy calculation.

Also, internal energy has to do with the kinetic and potential energies of molecules in a system, while enthalpy relates to the system and its surroundings.