CHEM 1A Study Guide - Midterm Guide: Boltzmann Equation, Partition Coefficient, Boiling-Point Elevation
Document Summary
Must account for all e transfers (heat/work) [change of e in system = q + w] Heat to system + chg in e. Heat to surroundings - chg in e. State variables (e, p, v, t, n ) They"re path independent p and q are dependent e transformations. Expanding gas at constant p [w = -p chgv] System expands against ext p: chg v>0. Doesn"t apply to compression b/c p isn"t constant. System expands against p that"s always a tiny bit less than its own. Reverse w/ a tiny shift yields max work. Take the integral to get: [w = -nrtln(vf/vi)] Q = 0, no heat transfer, so chg e = w. [q = -w] b/c chg e = 0, they"re dependent on each other. Heat capacity (c) : links heat transfers to chg e. System-dependent quantity [q = c chg t] Molar heat capacity: cm = c/n j/mol k. Specific heat capacity: cs = c/m j/gk.
