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Calculate ΔH for the following reaction:

8 Al(s) + 3 Fe3O4(s) --> 4 Al2O3(s) + 9 Fe(s)

sachin singh , 14 Years ago
Grade 12
anser 2 Answers
SAGAR SINGH - IIT DELHI

Last Activity: 14 Years ago

Dear sachin,

ΔH for a reaction is equal to the sum of the heats of formation of the product compounds minus the sum of the heats of formation of the reactant compounds:

ΔH = Σ ΔHf products - Σ ΔHf reactants

Omitting terms for the elements, the equation becomes:

ΔH = 4 ΔHf Al2O3(s) - 3 ΔHf Fe3O4(s)

The values for ΔHf may be found in the Heats of Formation of Compounds table. Plugging in these numbers:

ΔH = 4(-1669.8 kJ) - 3(-1120.9 kJ)

ΔH = -3316.5 kJ

 

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Sagar Singh

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pratik nayak

Last Activity: 14 Years ago

 

ΔH for a reaction is the sum of the heats of formation of the product compounds - the sum of the heats of formation of the reactant compounds:

ΔH = Σ ΔHf products - Σ ΔHf reactants

ΔH = 4 ΔHf Al2O3(s) - 3 ΔHf Fe3O4(s)

The values for ΔHf are present in the Heats of Formation of Compounds table.

 ΔH = 4(-1669.8 kJ) - 3(-1120.9 kJ)

ΔH = -3316.5 kJ

 

 

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