What is the standard enthalpy of formation (ΔH_f^ext{°}) value for CO_2(g) in kJ/mol?

In a reaction energy diagram, which part of the diagram represents the change in enthalpy (ΔH) for the reaction?

Which one of the following reactions would produce the largest amount of heat per mole of hydrogen?

Given the following vapor pressure data for a liquid metal at different temperatures, which method would you use to determine the enthalpy of vaporization (ΔH_vap)?Temperature (K): 400, 420, 440, 460Vapor Pressure (atm): 0.12, 0.22, 0.38, 0.65Choose the most appropriate approach:

Given the thermochemical equation: H2(g) + Cl2(g) → 2 HCl(g); ΔH = -184 kJ, what is the value of the enthalpy change per mole of HCl(g) produced?

For which one of the following reactions is the value of ΔH°_rxn equal to ΔH°_f for the product?

Which of the following is required for a correctly written thermochemical equation?

Given the reaction: N_2O(g) + NO_2(g) → 3 NO(g), what is the standard enthalpy change (ΔH°) for this reaction? (Standard enthalpies of formation: ΔH_f°[N_2O(g)] = 82 kJ/mol, ΔH_f°[NO_2(g)] = 34 kJ/mol, ΔH_f°[NO(g)] = 90 kJ/mol)

For the reaction 2NO(g) + O2(g) → 2NO2(g), the enthalpy change ΔH is negative and the entropy change ΔS is negative. The forward reaction is thermodynamically favored at which of the following temperatures?