A system does 125 J of work and cools down by releasing 438 J of heat. The change in internal energy is ____________ J.

Answer 1

Work done by the system = -

Work done by system = -125 J

Release of heat by the system = - (exothermic)

Heat released by the system = -438 J

∆U = q + w = -438 J + -125J

∆U = -563 J