7.3 Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Answers (1)
M manish

Gibbs free energy of formation(\Delta _{f}G^{0}) of  Cu_{2}S is less than that of  H_{2}S and  CS_{2} so that hydrogen and carbon are unable to reduce 

Cu_{2}S \rightarrow Cu. But the Gibbs free energy of formation(\Delta _{f}G^{0}) of Cu_{2}O is higher than that of CO. So, that carbon can able to reduce

 Cu_{2}O\rightarrow Cu.  Therefore the extraction of copper from its pyrite ore is more difficult than its oxide ore through reduction.

 

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