- #1
Varanasi
- 5
- 0
1. Homework Statement
10) Both iron (III) oxide and copper (IV) oxide are mined for use as primary ores in the production of pure iron and copper respectively. Historically, the earliest use of copper tools appears to be around 4500 BC. Iron tools appear much later; European artifacts have been dated to around 1200BC. Assuming that both metal ores were easily found, why do you think that iron tools were developed more recently than copper tools?
a) CuO2 --> Cu + O2 ΔGº = -129 kJ/mole
b) Fe2O3 --> Fe + 3/2 O2 ΔGº =-742 kJ/mole
2. Its a thinking question.
3. I'm unsure exactly where to go with this. I tried doing dG = -rtln(k) for each and trying to find some justification that way. I'm completely lost with these question. It has something to do with the fact that dG is higher for iron but that almost sounds like more of a reason for it to be earlier than copper rather than the other way around.
Something about the larger dG value has to explain it but I'm completely lost. I even tried dG = h - tdS because dS will be larger for iron because it makes 1.5 o2 but that means it needs less heat which gets me even farther from an answer...
10) Both iron (III) oxide and copper (IV) oxide are mined for use as primary ores in the production of pure iron and copper respectively. Historically, the earliest use of copper tools appears to be around 4500 BC. Iron tools appear much later; European artifacts have been dated to around 1200BC. Assuming that both metal ores were easily found, why do you think that iron tools were developed more recently than copper tools?
a) CuO2 --> Cu + O2 ΔGº = -129 kJ/mole
b) Fe2O3 --> Fe + 3/2 O2 ΔGº =-742 kJ/mole
2. Its a thinking question.
3. I'm unsure exactly where to go with this. I tried doing dG = -rtln(k) for each and trying to find some justification that way. I'm completely lost with these question. It has something to do with the fact that dG is higher for iron but that almost sounds like more of a reason for it to be earlier than copper rather than the other way around.
Something about the larger dG value has to explain it but I'm completely lost. I even tried dG = h - tdS because dS will be larger for iron because it makes 1.5 o2 but that means it needs less heat which gets me even farther from an answer...