A piston/cylinder system containing 1.25 kg of "laughing gas" (nitrous oxide, N20), is initially at 298 K and 1.00 bar. The system then goes through a process where heat transfer adds 101 kJ to the gas, and simultaneously the piston is moved in such a way that the product of pressure and volume in the cylinder is unchanged - in other words pV is constant during the heat addition. After the process has ended, the pressure of the N2O in the cylinder is 0.130 bar. N2O has a molecular weight of 44. (15 points) a) What is the entropy change of the gas due to this process? b) Was this process reversible? (Be sure to justify your answer.) c) Sketch the process on a T-s diagram. (Make sure to clearly label everything)

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?