enthalpy formation from Enthalpy reaction

Question

A scientist measures the standard enthalpy change for the following reaction to be -13.1 kJ :

CO(g) + H₂O(l)CO₂(g) + H₂(g)

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO₂(g) is

Answer: Kj/mol

Answer 1

Again, as in your previous question, the ∆H_rxn = ∑∆Hf_products - ∑∆Hf_reactants

-13.1 = (∆Hf_CO2 + 0) - (∆Hf_CO + ∆Hf_H2O(l))

Look up the ∆Hf for CO and H₂O(l) and plug those values into the above equation and then solve for ∆Hf CO₂(g)

**Be sure to use the values for the correct phases, e.g. use ∆H H2O liquid, not solid or gas.