Suppose icebergs (c = 2.03 J/g·°C; Lfus = 335 J/g) at 0° floated into an ocean (c = 3.93 J/g·°C) that was at 17°C. How much ice would have to melt—and then warm up—to lower the temperature of the ocean by 5 °C. (Note: Do not forget to include the phase change of iceberg to liquid.)

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.