# Problem: Dry chemical hand warmers utilize the oxidation of iron to form iron oxide according to the following reaction: 4 Fe(s) + 3O2(g) → 2Fe2O3(s)Standard thermodynamic quantities for selected substances at 25 o m C Reactant or productΔH°f (kJ/mol)Fe(s)0.0O2(g)0.0Fe2O3(s)-824.2  Calculate how much heat (in kilojoules) a hand warmer containing 21.0 g of iron powder produces.

###### FREE Expert Solution

We are asked to calculate how much heat (in kilojoules) a hand warmer containing 21.0 g of iron powder produces.

Note that we need to multiply each ΔH˚f by the stoichiometric coefficient since ΔH˚f is in kJ/mol.

Also, note that ΔH˚f for elements in their standard state is 0.

ΔH°rxn = 1648.4 kJ

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###### Problem Details

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

4 Fe(s) + 3O2(g) → 2Fe2O3(s)

Standard thermodynamic quantities for selected substances at 25 o m C

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

Calculate how much heat (in kilojoules) a hand warmer containing 21.0 g of iron powder produces.