At a certain temperature, K 5 1.1 3 103 for the reaction Fe31(aq) 1 SCN2(aq) 34 FeSCN21(aq) Calculate the concentrations of Fe31, SCN2, and FeSCN21 at equilibrium if 0.020 mole of Fe(NO3)3 is added to 1.0 L of 0.10 M KSCN. (Neglect any volume change.)
Ch.12: Thermodynamics Wednesday, January 20, 2016 9:56 AM • Why chemical reactions happen (and physical processes) • Demo: • Spontaneity: A spontaneous process that occurs without ongoing outside intervention ○ Ex. Ball rolling downhill ○ Ex. Water freezing at -10 degrees Celsius ○ Ex. Iron rusting • Reverse of spontaneous process: Nonspontaneous ○ Does not happen on its own ○ not necessarily impossible • Spontaneous reaction ○ May need help getting started ○ Not necessarily fast • What makes a reaction spontaneous ○ Is a spontaneous reaction equal to and exothermic reaction Combustion reaction = yes Demo reaction = no (spontaneous, but endot
