Which of the following quantities are known? Check all that apply. The efficiency of the engine, e The heat transfer rate for steam entering the engine, HH The constant pressure molar heat capacity of steam, Cp The molar flow rate of steam, n/t The temperature of the steam as it enters the engine, Th O The power output of the engine, P The heat transfer rate for steam leaving the engine, HC The temperature of steam as it leaves the engine, Tc