Hi, I'm taking a thermodynamics class and I'm stuck on how work relates to enthalpy and internal energy. Does work done by a system equal change in internal energy, change in enthalpy or does it depend on the situation? The question I'm stuck on asks for the work produced by a steam turbine and gives initial and final properties for the steam. I feel like the work produced by the turbine is just equal to the ΔU for the steam, but I could also see an argument for using ΔH. Any thoughts would be appreciated.