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Answer: Portable hot packs are available for skiers and

Chapter 6, Problem 104P

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QUESTION:

Portable hot packs are available for skiers and people engaged in other outdoor activities in a cold climate. The air-permeable paper packet contains a mixture of powdered iron, sodium chloride, and other components, all moistened by a little water. The exothermic reaction that produces the heat is a very common one—the rusting of iron:

\(4 F e(s)+3 O_{2}(g) \rightarrow 2 F e_{2} O_{3}(s)\)

When the outside plastic envelope is removed, \(\mathrm{O}_{2}\) molecules penetrate the paper, causing the reaction to begin. A typical packet contains 250 g of iron to warm your hands or feet for up to 4 hours. How much heat (in kJ) is produced by this reaction? (Hint: See Appendix 3 for \(\Delta H_{f}^{\circ}\) values.)

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QUESTION:

Portable hot packs are available for skiers and people engaged in other outdoor activities in a cold climate. The air-permeable paper packet contains a mixture of powdered iron, sodium chloride, and other components, all moistened by a little water. The exothermic reaction that produces the heat is a very common one—the rusting of iron:

\(4 F e(s)+3 O_{2}(g) \rightarrow 2 F e_{2} O_{3}(s)\)

When the outside plastic envelope is removed, \(\mathrm{O}_{2}\) molecules penetrate the paper, causing the reaction to begin. A typical packet contains 250 g of iron to warm your hands or feet for up to 4 hours. How much heat (in kJ) is produced by this reaction? (Hint: See Appendix 3 for \(\Delta H_{f}^{\circ}\) values.)

ANSWER:

Step 1 of 3

Here we have to calculate how much heat (in kJ) is produced by the given reaction reaction.

The reaction is,

   

 

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