If 515 J of heat is added to a gas that does 218 J of work as a result, what is the change in the energy of the system?

Answer 1

U = internal energy

w = work

q = heat

∆U = q + w

∆U = ?

q = 515 J

w = -218 J (negative sign since system does work on the surroundings)

∆U = 515 J - 218 J

∆U = 297 J