Which of the following statements correctly describes the calculation of the enthalpy change (ΔH_rxn) for a chemical reaction using bond enthalpies?

Calculate the standard enthalpy change for the following reaction at 25°C using the standard enthalpies of formation: C3H8 (g) + 5O2 (g) -> 3CO2 (g) + 4H2O (g). Given: ΔHf° [C3H8 (g)] = -104.7 kJ/mol, ΔHf° [CO2 (g)] = -393.5 kJ/mol, ΔHf° [H2O (g)] = -241.8 kJ/mol.

Choose the reaction that illustrates the standard enthalpy of formation (ΔHf°) for Ca(NO2)2.

Which of the following reactions represents the standard enthalpy of formation (ΔHₒƒ) for CsHSO4(s)?

Consider the combination reaction: 2Mg(s) + O2(g) → 2MgO(s) with ΔH = -1204 kJ. What is the enthalpy change for the decomposition of 1 mole of MgO(s) into Mg(s) and O2(g)?

What is the standard enthalpy of formation of the isomer C8H18 if the enthalpy change for its complete combustion is -5470 kJ/mol?

For which of the following reactions is the enthalpy change for the reaction equal to the standard enthalpy of formation (ΔHf°) of the product?

The enthalpy change for the following reaction is -483.6 kJ: 2 H2 (g) + O2 (g) --> 2 H2O (g). Therefore, the enthalpy change for the following reaction is ________ kJ: 6 H2O (g) --> 6 H2 (g) + 3 O2 (g).

Given the reaction Pb (s) + CO2 (g) → PbO (s) + CO (g) with ΔH° = +131.4 kJ, and the standard enthalpies of formation ΔHf° of CO2(g) = -393.5 kJ/mol and CO(g) = -110.5 kJ/mol, what is the standard enthalpy of formation for PbO(s)?