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Science Clinic => Chemistry => Topic started by: allihubbard on Nov 5, 2023

Title: How much energy (kJ) is released if 10.0g of Al(s) is reacted with excess Fe2O3(s) in the thermite ...
Post by: allihubbard on Nov 5, 2023

Question 1

For the reaction 3Fe(s) + C(s) Fe₃C(s), ΔH° = 21 kJ/mol and ΔS° = 20.4 J/mol·K at 25°C.  Estimate the minimum temperature above which the formation of cementite (Fe₃C) is favored.
◦ 1.0°C
◦ 970°C
◦ 700°C
◦ 1000°C
◦ 760°C

Question 2

How much energy (kJ) is released if 10.0g of Al(s) is reacted with excess Fe₂O₃(s) in the thermite reaction:  2Al(s) + Fe₂O₃(s) → Al₂O₃(s) + 2Fe(l)  ΔH° = - 822.8 kJ/mol
◦ 8,230 kJ
◦ 823 kJ
◦ 305 kJ
◦ 152 kJ
◦ 4,110 kJ

Title: How much energy (kJ) is released if 10.0g of Al(s) is reacted with excess Fe2O3(s) in the thermite ...
Post by: fowlerhop@rocketmail.com on Nov 5, 2023

Answer 1

760°C

Answer 2

152 kJ