1) The furnace is operated at 1600K. What are the most and least stable oxides at...

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1) The furnace is operated at 1600K. What are the most and least stable oxides at this temperature? 2) What is the maximum partial pressure of oxygen that allows reduction of CoO if the furnace is operated at 1675K? Alternatively, if the maximum partial pressure allowed is 10-2 atm, at what temperature should the furnace be operated on to ensure reduction? 3) Due to budget and safety constraints, the furnace must be operated at 1400C and at a partial pressure Po=10-0 atm. Chromium oxide is found in the furnace and needs to be reduced. Can this be done under the above conditions? 4) If temperature and pressure cannot be changed, what else can be done to allow reduction of chromium oxide, and what is the necessary ratio? 5) Consider the reaction 2Fe(s)+O2 (g)-2FeO(s). Determine the change in entropy and in enthalpy of the reaction. 6) What will be free energy and the direction of the reaction when the system is left in a furnace at 1560C with a large amount of Mn? H . AG = RT IN PO KJ OK 0 -100 - 200 -300 - 400 - 600 -500 3/2Fe+0-1304 - 700 - 800 - 900 - 1000 - 1100 ALPH PCO/PCO Ang+02-24020 - 1200 0 4/30+02-2130203 si-0-S10/ 7-11-0-f10) 40u+0-200 4/3A1+0-2/3A 200 2g+0-2Mgo /20a+0-200 PO (atm) 10-8 10-7 10-6 10-14 10-12 10-10 109 108 107 108 105 104 PCO/PCO PH/PHO 2N+0-2NO M M 200+0-2000 20-0-200 M 2Fe+0=2 2Mn-0-2MnO TM temperature, C 400 600 800 1000 10-100 10-80 10-60 M 10-50 M Fe+0-2F0045 200+0-2002/M 1200 2H+0 20 M C+0-00 M M B 10-3 1 M 104 101 102 102 104 106 10-8 10-10 10-12 10-14 10-16 10-18 10-20 10-22 M Melting point of metal -B Boiling point of metal 1020 M Melting point of oxide 10-24 10:26 10-30 1400 1600 10-4210-38 1034 1014 102 10-1 10- 102 108 104 105 106 107- J 10% 109- 1010 1011 1012 1013 1013 10-3 10-2 10-1 10 102 103 ! 10% 1 100 108 18 107 108 109 1010 1071 1012 1) The furnace is operated at 1600K. What are the most and least stable oxides at this temperature? 2) What is the maximum partial pressure of oxygen that allows reduction of CoO if the furnace is operated at 1675K? Alternatively, if the maximum partial pressure allowed is 10-2 atm, at what temperature should the furnace be operated on to ensure reduction? 3) Due to budget and safety constraints, the furnace must be operated at 1400C and at a partial pressure Po=10-0 atm. Chromium oxide is found in the furnace and needs to be reduced. Can this be done under the above conditions? 4) If temperature and pressure cannot be changed, what else can be done to allow reduction of chromium oxide, and what is the necessary ratio? 5) Consider the reaction 2Fe(s)+O2 (g)-2FeO(s). Determine the change in entropy and in enthalpy of the reaction. 6) What will be free energy and the direction of the reaction when the system is left in a furnace at 1560C with a large amount of Mn? H . AG = RT IN PO KJ OK 0 -100 - 200 -300 - 400 - 600 -500 3/2Fe+0-1304 - 700 - 800 - 900 - 1000 - 1100 ALPH PCO/PCO Ang+02-24020 - 1200 0 4/30+02-2130203 si-0-S10/ 7-11-0-f10) 40u+0-200 4/3A1+0-2/3A 200 2g+0-2Mgo /20a+0-200 PO (atm) 10-8 10-7 10-6 10-14 10-12 10-10 109 108 107 108 105 104 PCO/PCO PH/PHO 2N+0-2NO M M 200+0-2000 20-0-200 M 2Fe+0=2 2Mn-0-2MnO TM temperature, C 400 600 800 1000 10-100 10-80 10-60 M 10-50 M Fe+0-2F0045 200+0-2002/M 1200 2H+0 20 M C+0-00 M M B 10-3 1 M 104 101 102 102 104 106 10-8 10-10 10-12 10-14 10-16 10-18 10-20 10-22 M Melting point of metal -B Boiling point of metal 1020 M Melting point of oxide 10-24 10:26 10-30 1400 1600 10-4210-38 1034 1014 102 10-1 10- 102 108 104 105 106 107- J 10% 109- 1010 1011 1012 1013 1013 10-3 10-2 10-1 10 102 103 ! 10% 1 100 108 18 107 108 109 1010 1071 1012

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To address your questions 1 At 1600K the most stable oxide is usually the one with the highest negative Gibbs free energy of formation G Conversely th... View the full answer