I need help with these questions, explained and answered! :) Part A: Another exa

Question

I need help with these questions, explained and answered! :)

Part A:

Another example of a coupled reaction used in the smelting of copper ore involves the following two reactions performed at 375 C:
(1) Cu2O(s)2Cu(s)+12O2(g) G (at 375 C) = +140.0 kJ (+33.5 kcal)
(2) C(s)+ 12O2(g)CO(g) G (at 375 C) = -143.8 kJ (-34.5 kcal)
Derive the overall reaction for the coupled reaction.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Part B:

Calculate the net free-energy change for the coupled reaction.

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

Part A:

The over all reaction for the coupled reaction is: obtaned by combining both the reactions

Cu2O (s) + C (s) ------> 2 Cu (s) + CO (g)

Part B:

Net Free energy change for the coupled reaction = +140.0 kJ-143.8 kJ = 0.2 kJ

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