Question

The value of ΔH°rxn for the reaction below is –1036 kJ:

2H2​S(g)+3O2​(g) -> 2SO2​(g)+2H2​O(g)
Estimate the average energy of the individual bonds in SO2 from the appropriate average bond energies. (in kJ/mol)

Answer 1

To estimate the average energy of the individual bonds in SO2, we need to consider the bond energies involved in the reaction. In the given reaction, 2 H-H bonds and 1 O=O bond are broken on the reactant side, while 4 O-H bonds are formed on the product side. Therefore, the average energy of the individual bonds in SO2 can be estimated by taking the difference between the total energy needed to break the bonds and the total energy released to form the bonds: 833 kJ/mol.

Step-by-step explanation:

To estimate the average energy of the individual bonds in SO2, we need to consider the bond energies involved in the reaction. In the given reaction, 2 H-H bonds and 1 O=O bond are broken on the reactant side, while 4 O-H bonds are formed on the product side. The energy changes can be calculated as follows:

Energy needed to break the bonds on the reactant side: 2 x 436 kJ/mol + 1 x 151 kJ/mol = 1023 kJ/mol

Energy released to form the bonds on the product side: 4 x 464 kJ/mol = 1856 kJ/mol

Therefore, the average energy of the individual bonds in SO2 can be estimated by taking the difference between the total energy needed to break the bonds and the total energy released to form the bonds: 1856 kJ/mol - 1023 kJ/mol = 833 kJ/mol.

Answer 2

The average energy of the individual bonds in SO2 can be estimated by taking the difference between the energy required to break bonds and the energy released to form bonds.

Step-by-step explanation:

In order to estimate the average energy of the individual bonds in SO2, we need to consider the bond energies of the reactants and products.

From the given information, 2 moles of H-H bonds and 1 moles of O=O bond are broken in the reactants, while 4 moles of O-H bonds are formed in the products.

Using the given bond energies, we can calculate the energy changes as follows:

1. Energy required to break bonds: 2 x 436 kJ/mol + 1 x 498.7 kJ/mol = 1370.4 kJ/mol
2. Energy released to form bonds: 4 x 110 kJ/mol = 440 kJ/mol

The average energy of the individual bonds in SO2 can be estimated by taking the difference between the energy required to break bonds and the energy released to form bonds: 1370.4 kJ/mol - 440 kJ/mol = 930.4 kJ/mol.