What is the bond energy per mole required to break all the bonds in a molecule of oxygen (O_2) under standard conditions?

• A. 218 kJ/mol
• B. 146 kJ/mol
• C. 945 kJ/mol
• D. 498 kJ/mol

Answer: (D)

Verified step by step guidance

1. Identify the type of bond present in the oxygen molecule (O\_2). Oxygen molecules consist of a double bond between the two oxygen atoms.
2. Understand that bond energy per mole refers to the amount of energy required to break one mole of these bonds in the molecule under standard conditions.
3. Recall or look up the average bond energy value for the O=O double bond, which is typically given in units of kJ/mol.
4. Recognize that the bond energy for the O=O double bond is approximately 498 kJ/mol, meaning this is the energy needed to break all bonds in one mole of O\_2 molecules.
5. Compare the given options with the known bond energy value to confirm that 498 kJ/mol is the correct bond energy required to break all bonds in O\_2.