Chemistry Practice Problems Hess's Law Practice Problems Solution: Consider the following set of reactions:CO + 1/2O2...

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Solution: 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?

Problem

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?