..Equation for Law of conservation of mass and energy for a nozzle

13. An isobaric steam generating process starts with saturated liquid at 143 kPa. The change in entropy is equal to the initial entropy. What is the change in enthalpy in kJ/kg during the process? (Hint: Not all of the liquid is vaporized)

4. A single-stage cylinder air compressor is rated at 6.5 cubic meter per minute of air .Suction conditions are 1 atm and 27 deg C and discharge pressure of 1034 KPa. The compression process follows PV1.35 = C. What is the engine Kw power needed to drive the unit if the combined engine-compressor efficiency is 84%?

Question 3.) An engine has an inlet stagnation condition of 300 bar and 4000 kelvin. Methane and liquid oxygen make up the products of combustion and have a specific heat ratio k = 1.14 and a gas constant R = 383 J/kg-k. The nozzle has an exit to throat area ratio of A₂ / Ath = 34.34 and has an exit diameter of 1.3 meters. Calculate the following: (a) Mass flow rate m for choked flow (b) Critical Mach numbers (c) Critical pressures