Asteam power plant operates on the ideal reheat rankine cycle. steam enters the high-pressure turbine at 8 mpa and 600 oc and leaves at 3 mpa. steam is then reheated at constant pressure to 500 oc before it expands to 20 kpa in the low-pressure turbine. determine: a) the turbine work ouput in kj/kg; b) the thermal efficiency of the cycle (%)

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?