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sachin singh Grade: 12
```        Calculate ΔH for the following reaction:
8 Al(s) + 3 Fe3O4(s) --> 4 Al2O3(s) + 9 Fe(s)```
7 years ago

## Answers : (2)

SAGAR SINGH - IIT DELHI
879 Points
```										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
B.Tech, IIT Delhi

```
7 years ago
pratik nayak
33 Points
```
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

please  approve my answer if u like it
```
7 years ago
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