Iron Graphite

Estimated minimum temperature magnetite iron can be reduced to graphite?

Estimation of the minimum temperature that can be Fe3O4 magnetite iron reducing graphite (s) + 2C (s)> 2CO2 (g) + 3 Fe (s) Delta S (R) = 351.44 J / K and standard molar enthalpy of formation magnetite and CO2 (g) -1118.4 and -393.51 kJ / ml, respectively, 1 670 C 2 C 3 magnetite in 1790 reduced carbon at a temperature of 4 984 C 5 787 C 6 magnetite can be reduced by carbon at any temperature 7 535 C

1 670 deltage C = deltaH - deltage deltas where 0 is the temperature is the lowest at which the reaction can then occur, and delta deltaH = temperature (K) = delta H / delta S (control units) with this problem would be 331,380 J / 351.44 J / K [J 331,380 is because the magnetite is reduced (1118.4 kJ) and 2 moles of CO2 (-787.02 kJ). This gives 331,380 or 331.38 kJ J] It is equal to 942.92 K or Appx. 670 C.