2.25 kg of an ideal gas is expanded from a pressure of 7 bar and volume of 1.5 m² to a pressure of 1.4 bar and volume of 4.5 m3. The change in internal energy is 500 kJ. Specific heat at constant volume of 0.72 kJ / kg.k. Determine gas constant, polytrophic index, work done, initial and finale temperature.

just part d answer options are 1.8kJ 1.3J 1.3kJ 1.8J

A piston/cylinder apparatus initially contains 0.4 kg of saturated water vapor at a pressure of 200 kPa. The water vapor is now heated until the (extensive) volume of the H,0 is 0.5 m³ (state 2). (a) Fill in the following table. H,0 State Temp. T(C) P (kPa) Specific volume Volume Specific internal energy u (kJ/kg) 2529.1 Pressure P, = 200 kPa V (m?) Sat. vapor v (m³/kg) 1 200 0.5 state 1. (b) Determine the total work done by the H20 during the process, 1→2. (c) Determine the total heat transfer to the H,0 during the process, 1→2. (d) Draw the process on a P-v diagram. Label both states. (e) EXTRA CREDIT: Determine the change in enthalpy of the H20 from 1>2 and explain why this answer makes sense.