In an oxygen molecule, the two oxygen atoms are held together by a double bond with a bond energy of 495 kj/mol. using the balanced chemical equation (shown above), how much energy must be expended in breaking the o=o bonds?

The energy need to break this 0=0 bond is 495 kJ/mol

Explanation:

Step 1: Data given

oxygen molecule = O2

In an O2 molecule, the 2 O-atoms are held together by a double bond with a bond energy of 495 kJ/mol.

To break this chemical bound, it requires energy

2O(g) → O2(g)

The bound energy of  a double oxygen bound = 495 kJ/mol

Since we have 1 molecule (consisting in 2 O atoms)

The energy need to break this 0=0 bond is 495 kJ/mol