- #1

## Homework Statement

Using Hess's law, calculate the ΔH value for the following reaction:

FeO

_{(s)}CO

_{(g)}→Fe

_{(s)}+CO

_{2}

_{(g)}

Use these three reactions:

1. Fe

_{2}O

_{3}

_{(s)}+3CO

_{(g)}→2Fe

_{3}O

_{4}

_{(s)}+CO

_{2}

_{(g)}ΔH= -25.0 kJ

2. 3Fe

_{2}O

_{3}

_{(s)}+CO

_{(g)}→2Fe

_{3}O

_{4}

_{(s)}+CO

_{2}

_{(g)}ΔH= -47.0 kJ

3. Fe

_{3}O

_{4}

_{(s)}+CO

_{(g)}→3FeO

_{(s)}+CO

_{2}

ΔH= +38.0 kJ

## Homework Equations

## The Attempt at a Solution

This is what I have done so far:

Reversed reaction 3

3FeO

_{(s)}+CO

_{2}→Fe

_{3}O

_{4}

_{(s)}+CO

_{(g)}ΔH = -38.0 kJ

I've tried some other things but each time I get the incorrect answer. The examples that I was shown were way easier than this.

I'm not really sure what to do next. I reversed reaction 3 to get FeO on the left side. Any help on the steps I should take to complete this would be great... I find this question very confusing.