Apiston-cylinder device contains 1.370 kg of nitrogen gas at 120 kpa and 27°c. the gas is now compressed slowly in a polytropic process during which pv^1.25= constant the process ends when the volume is reduced by one-half. determine the entropy change of nitrogen during this process. δ/k (round to four decimal places)

For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor