Given the following:2 Fe(s)  +  3/2 O2(g)  →  Fe2O3(s)  ΔHorxn = -824.2 kJ/mol3 Fe(s)  +  2 O2(g)  →  Fe3O4(s)  ΔHorxn = -1118.4 kJ/molCalculate the ΔHorxn for the following equation:3 Fe2O3(s)  →  2 Fe3O4(s)  +  1/2 O2(g)Your answer should be to one place past the decimal point.

Question
Asked Oct 21, 2019

Given the following:

2 Fe(s)  +  3/2 O2(g)  →  Fe2O3(s)  ΔHorxn = -824.2 kJ/mol

3 Fe(s)  +  2 O2(g)  →  Fe3O4(s)  ΔHorxn = -1118.4 kJ/mol

Calculate the ΔHorxn for the following equation:

3 Fe2O3(s)  →  2 Fe3O4(s)  +  1/2 O2(g)

Your answer should be to one place past the decimal point.

check_circleExpert Solution
Step 1

 Thermodynamic is the branch of chemistry that mainly deals with the heat transfer between system and surroundings. Here system is the substance for which the heat content is studied and remaining part of universe is consider as the surroundings.

Step 2

The heat content of any substance or reaction system can be expressed in terms of enthalpy whereas the randomness in the system is associated with the entropy of system.

Hess law states that the enthalpy change for multistep chemical reaction is the sum of all enthalpy changes. It can be written as;

-ΔΗ+ ΔΗ+ΔΗ . . .
Σ ΔΗ
reaction
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Image Transcriptionclose

-ΔΗ+ ΔΗ+ΔΗ . . . Σ ΔΗ reaction

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Step 3

Given:

...
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