You may want to reference (Pages 277-280) Section 6.9 while completing this prob

Question

You may want to reference (Pages 277-280) Section 6.9 while completing this problem Constants I Periodic Table Dry chemical hand warmers utilize the oxidation of iron to form iron oxide according to the following reaction Part A 4Fe(s) +302(g)2Fe20s(s) Standard thermodynamic quantities for selected Calculate AHn for this reaction Express the energy in kilojoules to one decimal place. substances at 25 C Reactant ???, (kJ/mol) or product Pe(o) 0.0 02() Fe03(s)-824.2 0.0 ??? k.J Submit Part B This question wl be shown after you complete previous question(s) 0232RC

Explanation / Answer

answer -

?H°rxn = ? ?H°f, products - ? ?H°f, reactants

4Fe(s)+3O2(g)?2Fe2O3(s)

?H?f(kJ/mol) Fe(s) = 0.0 O2(g)= 0.0    Fe2O3(s) = ?824.2

?H°rxn = 2Fe2O3(s) - (4Fe(s)+ 3O2)

    = 2 x ?824.2 - { 4 x 0.0 + 3 x 0.0}

= -1648.4 kJ

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