Problem: For the reaction, Fe2O3(s) + 3 H2(g) <=> 2 Fe(s) + 3 H2O(g), ΔG° = 53 kJ at 25 °C and ΔH° = 100 kJ. Which of the following is completely true about the relationship between ΔG and T for this reaction?a. ΔG < 0 when T > 635 Kb. ΔG < 0 when T < 635 Kc. ΔG < 0 at all temperatured. ΔG = 0 when T < 635 Ke. ΔG = 0 when T > 635 K

FREE Expert Solution

We’re being asked to determine the relationship of spontaneity or standard free energy change (ΔG) and high temperature (635 K) for the reaction:


Fe2O3(s) + 3 H2(g) ⇌ 2 Fe(s) + 3 H2O(g),                            ΔG° = 53 kJ at 25 °C and ΔH° = 100 kJ


In this case, we can determine ΔS and use the relationship between ΔS and ΔH.  


We can calculate for ΔS  using the following equation:


G° = H°-TS


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Problem Details

For the reaction, Fe2O3(s) + 3 H2(g) <=> 2 Fe(s) + 3 H2O(g), ΔG° = 53 kJ at 25 °C and ΔH° = 100 kJ. Which of the following is completely true about the relationship between ΔG and T for this reaction?

a. ΔG < 0 when T > 635 K

b. ΔG < 0 when T < 635 K

c. ΔG < 0 at all temperature

d. ΔG = 0 when T < 635 K

e. ΔG = 0 when T > 635 K

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