Using the table below, estimate δh for the "water splitting reaction": H₂O(g) → H₂(g) + 12 O₂(g).

Calculate the enthalpy of the reaction 2NO(g) + O₂(g) → 2NO₂(g) given the following reactions and enthalpies of formation: 1/2N₂(g) + O₂(g) → NO₂(g), ΔH^∘_a=33.2 kJ 1/2N₂(g) + 1/2O₂(g) → NO(g), ΔH^∘_b=90.2 kJ

Which answer best describes the transfer of heat that occurs when 1.20 mol of H₂ reacts?

Which answer best describes the transfer of heat that occurs when 1.40 mol of H₂ reacts?

Given the following at 25°C, calculate ΔH_f for HCN(g) (in kJ/mol) at 25°C.