What steps so I need to use to solve this Head's Law problem?

Question

The enthalpy of combustion of solid carbon to form carbon dirs ide is -393.7 kJ/mol carbon, and the enthalpy of combustion carbon monoxide to form carbon dioxide is-283.3 kJ/mol. Use this data to calculate ΔH for the reaction

 

Answer 1

For the record, it is Hess' Law, not Head's Law.  Also, we can't answer this question because we don't know the target equation for which we are supposed to calculate ∆H.  You have 2 equations:

C(_s) + O₂(g) ===> CO₂(g)

CO(g) + 1/2 O₂(g) ===> CO₂(g)

 

Now, what reaction do you want to solve for?