# Problem: Consider the following set of reactions:CO + 1/2O2 → CO2              ΔH = −283 kJ/molC + O2 → CO2                    ΔH = −393 kJ/molThe equations given in the problem can be added together to give the following reaction:overall: C + 1/2O2 → CO Which one of them must be reversed?

🤓 Based on our data, we think this question is relevant for Professor Opotowsky's class at CPP.

###### Problem Details

Consider the following set of reactions:

CO + 1/2O2 → CO2              ΔH = −283 kJ/mol

C + O2 → CO2                    ΔH = −393 kJ/mol

The equations given in the problem can be added together to give the following reaction:

overall: C + 1/2O2 → CO

Which one of them must be reversed?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofConsider the following set of reactions:CO + 1/2O2 → CO2    ...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 4 minutes and 14 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Opotowsky's class at CPP.