Question

Use the reaction equation and bond energies to answer the question.

2H2O → 2H2 + O2

H-O: 467 kJ/mol

H-H: 432 kJ/mol

O=O: 495 kJ/mol

What is the total energy of the reaction? Is this an endothermic or exothermic reaction?

509 kJ/mol, endothermic

–509 kJ/mol, endothermic

–509 kJ/mol, exothermic

509 kJ/mol, exothermic

Answer 1

Answer:

the answer is a

because energy is required to break the bond means endothermic (and endothermic is +ve)

Answer 2

Answer:

The total energy of the reaction is –509 kJ/mol, which indicates that the reaction is exothermic. This means that the reaction will release energy in the form of heat.

Explanation:

From the above question,

They have given :

Use the reaction equation and bond energies to answer the question.

2H2O → 2H2 + O2

H-O: 467 kJ/mol

H-H: 432 kJ/mol

O=O: 495 kJ/mol

The enthalpy change for the reaction is +586 kJ/mol.

The enthalpy change for the reaction can be calculated by subtracting the bond energies of the reactants from the bond energies of the products.

The bond energies of the reactants are,

                     = (2 × 467 kJ/mol) + (2 × 432 kJ/mol)

                     = 1366 kJ/mol.

The bond energies of the products are (2 × 432 kJ/mol) + (495 kJ/mol)

                    = 1419 kJ/mol.

The enthalpy change for the reaction is therefore (1419 kJ/mol – 1366 kJ/mol)         = +586 kJ/mol.

What is the total energy of the reaction? Is this an endothermic or exothermic reaction?

509 kJ/mol, endothermic

–509 kJ/mol, endothermic

–509 kJ/mol, exothermic

509 kJ/mol, exothermic

Answer : –509 kJ/mol, exothermic

The total energy of the reaction is –509 kJ/mol, which indicates that the reaction is exothermic. This means that the reaction will release energy in the form of heat.

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