A 2.01 kg of air at 24.78 C underwent an isometric process wherein its initial pressure of 52.18 kPa was doubled. Determine the heat (kJ) involved in the process. Consider the individual gas constant, specific heat at constant pressure, and specific heat ratio of air as 0.287 kJ/kg-K, 1.00 kJ/kg-K, and 1.4 respectively.

A piston-cylinder assembly contains a two-phase liquid-vapor mixture of water with an initial dryness fraction of 50%. The mass of the piston is 15 kg with a diameter of 10 cm. The surroundings exert a pressure of 1 atm in the piston. Heat is added to the system under the isopiestic process until the piston hits the stops. The final condition of the steam is saturated vapor. Determine the work in kW if the mass of the mixture is 17.521 kg/s. (PLEASE DO NOT ROUND OFF INTERMEDIATE ANSWERS, ONLY THE FINAL ANSWER IN THREE DECIMAL PLACES)

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A piston-cylinder device initially contains 10L of liquid water at 25C and at atmospheric pressure of 101.325 kPa. Heat is added at constant pressure until the entire liquid is vaporized. (a) what is the mass of water (b) final temperature (c) amount of heat absorbed by the water.