Using the AHf and the Sº values from the table, estimate the minimum temperature at which magnetite can be reduced to iron by graphite. Fe3O4(s) + 2C (s, graphite) → 2CO2 (g) + 3Fe (s) AH (kJ/mol) Sº (J/K.mol) -1118.4 146.4 Substance Fe3O4(s) C(s, graphite) CO2(g) Fe (s) 0 5.7 -393.5 213.7 247.6 O Magnetite will be reduced by carbon at any temperature. 54.3°C 2.34°C 1012°C Magenetite cannot be reduced by carbon at any temperature. Question 21 1 pts What is the enthalpy change for the chemical reaction in question 20? 0 -142.05 kJ/mol O-311.41 kJ/mol 0-538.14 kJ/mol 311.41 kJ/mol