Unit 5 Review - Chpt 13

1. Unit 5 Review - Chpt 13 • Equilibrium concepts • K expression - mass action Q • Kp = K(RT)n n is prod - react #of moles • ICE method, use approximations when appropriate • Le Chatelier’s Principle

2. Unit 5 Review - Chpt 17 • Thermo concepts - Entropy, Free Energy and Spontaneity • Suniv = Ssyst + Ssurr for spontaneous process Suniv > 0 • Calc Ssurr = - H/T is syst exo or endo? • Sorxn =  nSoprod -  nSoreact

3. Free Energy • A measure of whether a reaction is spontaneous. Also the maximum amount of work that can be done by a process (the energy that is free to do work) • Go = Ho - TSoomeans standard state • Go=  nGoprod -  nGoreact • Grxn = Go - RTlnQ At equilibrium G = 0 and Q becomes K Go = -RTlnK also Ho = TSo calc Temp