# The heat of formation of Fe2O3(s) is 826.0 kJ/mol. Calculate the heat of the reaction when a 43.20 g sample of iron is reacted. a. 159.7 kJb. 1.784 × 104 kJc. 638.9 kJd. 1278 kJe. 319.5 kJ thanks for your help! :)

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The heat of formation of Fe2O3(s) is 826.0 kJ/mol. Calculate the heat of the reaction when a 43.20 g sample of iron is reacted.

a. 159.7 kJ
b. 1.784 × 104 kJ
c. 638.9 kJ
d. 1278 kJ
e. 319.5 kJ

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Step 1

Given,

Heat of formation of Fe2O3 = 826.0 kJ/mol

Mass of iron, Fe = 43.20 g

Moles of Fe can be calculated as:

Step 2

The balanced chemical reaction for the formation of Fe2O3 from iron, Fe can be written as :

4 Fe (s) + 3 O2 (g) → 2 Fe2O3 (s)

From the given reaction, it is evident that :

Step 3

The standard enthalpies of formation are:

△f H (Fe) = 0 kJ/mol

△f H (O2) = 0 kJ/mol

△f H (Fe2O3) = 826.0 kJ/mol

The hea...

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