Question

Calculate the enthalpy of reaction (ΔH rxn ​ ) for the following reaction: Fe 2 ​...

Calculate the enthalpy of reaction (ΔH rxn ​ ) for the following reaction:

Fe 2 ​ O 3 ​ (s) + 3 CO(g) → 2 Fe(s) + 3 CO 2 ​ (g)

Given:

4 Fe(s) + 3 O 2 ​ (g) → 2 Fe 2 ​ O 3 ​ (s) ΔH = –1648 kJ

2 CO 2 ​ (g) → 2 CO(g) + O2(g) ΔH = +565.4 kJ

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Answer #1

Lets number the reaction as 0, 1, 2 from top to bottom

required reaction should be written in terms of other reaction

This is Hess Law

required reaction can be written as:

reaction 0 = -0.5 * (reaction 1) -1.5 * (reaction 2)

So, deltaHo rxn for required reaction will be:

deltaHo rxn = -0.5 * deltaHo rxn(reaction 1) -1.5 * deltaHo rxn(reaction 2)

= -0.5 * (-1648.0) -1.5 * (565.4)

= -24.1 KJ

Answer: -24.1 KJ

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