Consider the reaction. c2h5oh (l) ⟶ c2h6 (g) + 12o2 (g). state what further data would be needed to obtain δrh∘ at 500∘c and 1 bar.

For this type of problem, it is essential for you to have a data on the standard heats of formation of the substances given. For elemental substances or diatomic gases, the standard heat of formation is 0. Standard means the temperature is at 0°C and pressure at 1 atm. Calculate the standard heat of reaction using:

ΔH°rxn = ∑ (Stoichiometric coefficient*ΔHf of products) - ∑ (Stoichiometric coefficient*ΔHf of reactants)

Then, use this equation to find the reaction at T = 500°C and P = 1 bar:

ΔHrxn = ΔH°rxn + [∑ (Stoichiometric coefficient*Cp of products) - ∑ (Stoichiometric coefficient*ΔHf of reactants) ]ΔT

So, you also need the Cp or specific heat capacities of the substances.