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11 Dec 2019

Write the chemical equation for the combustion of the iron wire. Use thermochemical data from your physical chemistry textbook to derive the value of ∆cU for Fe given in the experiment.

The chemical eqaution is 4Fe(s) + 3O2(g) ---> 2Fe2O3(s)

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Related questions

4. Use data from the table of thermochemical data (Appendix C) to calculate Delta G Standard for the reactions shown.

A. 2Fe2O3(s) >> 4Fe(s) + 3O2(g)

B. 2PCl3(g) + O2(g) >>2POCl3(g)

Dry chemical hand warmers utilize the oxidation of iron to form iron oxide according to the following reaction:

4Fe(s)+3O2(g)→2Fe2O3(s)

Standard thermodynamic quantities for selected substances at 25 ∘C

Reactant or product ΔH∘f(kJ/mol)
Fe(s) 0.0
O2(g) 0.0
Fe2O3(s) −824.2

Part A

Calculate ΔH∘rxn for this reaction.

Express the energy in kilojoules to one decimal place.
ΔH∘rxn = kJ

Use the standard enthalpies of formation from Appendix II (A-7 toA-12) to calculate the enthalpy change (in kJ) for the reduction ofiron (III) oixde to iron at 298 K and 1 atm. (Calculate it for thereaction as written, namely 2 moles of iron (III) oxide and 3 molesof carbon.)

2Fe2O3(s) + 3C(s) --> 4Fe(s) +3CO2(g)

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