Respuesta :
The question is incomplete, the correct question is:
Copper has been used for thousands of years, either as a pure metal or in alloys. It is frequently used today in the production of wires and cables. Copper can be obtained through smelting or recycling. Determine the energy associated with each of these processes in order to recycle 1.08 mol Cu. The smelting of copper occurs by the balanced chemical equation: CuO(s)+CO(g) Cu(s)+CO2?(g) where ?H°f, CuO is = -155 kJ/mol. Assume the process of recycling copper is simplified to just the melting of the solid Cu starting at 25°C. The melting point of Cu is 1084.5°C with ?H°fus = 13.0 kJ/mol and a molar heat capacity, cp,Cu = 24.5 J/mol·°C.
Enthalpy change for the reaction recovering ?
Cu from CuO Energy for recycling Cu?
Answer:
Energy for recovering Cu from CuO = - 138. 24kJ
the total energy for recycling Cu is 42.07kJ
Explanation:
CuO(s) + CO(g) - - - - - - - > Cu(s) + CO2(g)
ΔHrxn = ΔHf(products) - ΔHf(reactants)
= ΔHf(CO2) - (ΔHf(CO)) + Δ Hf(CuO))
= - 393.5 kJ/mol - (-110.5 kJ/mol + ( - 155 kJ/mol)
= - 393.5 kJ/mol + 265.5 kJ/mol
= - 128 kJ/mol
for 1.08 mol of Cu
ΔH= - 128 kJ/mol × 1.08 mol = - 138. 24 kJ
Therefore,
Energy for recovering Cu from CuO = - 138. 24kJ
Part.2 :-
Total energy required = Heat required to raise the temperature of Cu from 25°C to 1084.5°C (q1) + Heat required to melt Cu at 1084.5°C(q2)
q1= n × ΔT × Cp
q1 = 1.08 mol × (1084.5°C - 25°C) × 24.5 J/mol 0C
q1 = 28.03 kJ
q2 = ΔHfus × n
q2 = 13.0 kJ/mol × 1.08 mol
q2 = 14.04kJ
Therefore,
Energy for recycling Cu = 28.03 kJ + 14.04kJ = 42.07kJ
Therefore, the total energy for recycling Cu is 42.07kJ
