1. The problem statement, all variables and given/known data a heat engine draws 200J of heat from the hot reservoir at 400K produces 110J of useful work and dumps 90J into the cold reservoir at 200K could this engine be built why or why not? 2. Relevant equations PV=NkbT 3. The attempt at a solution Not Sure on how I would set this equation up to figure out an answer N(1.38x10^-23(273K).... Need direction in the right path..