chemistry question

Question

Using the standard enthalpies of formation, what is the standard enthalpy of reaction?

CO(g)+H2O(g)⟶CO2(g)+H2(g)

ΔH∘rxn = _____kJ

Answer 1

∆Hº_rxn = ∑∆Hº_fproducts - ∑∆Hº_freactants

Look up the ∆Hºf for the reactant CO2(g) and subtract from that the sum of the ∆Hºf for CO(g) and H2O(g).

NOTE: You don't need to use H₂ since it's value will be zero. Also be careful to use ∆Hºf for the appropriate phase, e.g. H₂O gas, not H₂O liquid, as they are different.