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The reaction that occurs in heat packs that are used to treat sports injuries is:                ...

The reaction that occurs in heat packs that are used to treat sports injuries is:
                4Fe(s) + 3O2(g)   Ò   2Fe2O3(s)    ΔH = -1652 kJ
How much heat is released when 1.0 gram of Fe(s) is reacted with excess O2(g)?

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Answer #1

The balanced chemical reaction taking place is

The enthalpoy change for the reaction is

.

The sign of enthalpy change indicates that heat is being released.

Molar mass of Fe = 55.85 g/mol.

As evident by the balanced reaction, when 4 moles of Fe is completely reacting with O2, the amount of heat released is 1652 kJ.

Mass of 4 moles of Fe =

Since 223.4 g of Fe produces 1652 kJ of heat.

Heat released by 1 g of Fe is

Hence, the heat released by 1 g of Fe when reacting with excess O2 is 7.394 kJ.

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