Question 1
For the reaction 3Fe(s) + C(s)

Fe
3C(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 (Fe
3C) 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 Fe
2O
3(s) in the
thermite reaction: 2Al(s) + Fe
2O
3(s) → Al
2O
3(s) + 2Fe(l) Δ
H° = - 822.8 kJ/mol
◦ 8,230 kJ
◦ 823 kJ
◦ 305 kJ
◦ 152 kJ
◦ 4,110 kJ