CHM ENG 141 Study Guide - Midterm Guide: Superheating, Heating Element, Air1

• School: Berkeley
• Department: Chemical & Biomolecular Engineering
• Course: CHM ENG 141
• Professor: All

Document Summary

Closed book and notes (15 points: consider an ideal gas with constant heat capacities. Indicate whether the enthalpy (h) and the entropy (s) of the system increase, decrease or remain unchanged during the following processes: H decreases ( h < 0); ssystem decreases ( ssys < 0) B) adiabatic reversible compression of a superheated vapor; H increases ( h > 0); s remains constant ( s = 0) H remains constant ( h = 0); s increases ( s > 0) (30 points: a closed insulating cylinder is fitted with a non-conducting, frictionless floating piston which divides the cylinder into sections a and b. The two sections contain air with equal number of moles, n0, and initially at the same conditions, t1 = 300 k and. Q& in section a is activated and the air temperatures slowly increase: t. A in section a because of heat transfer and tb in.