Understanding the Concept
* Bond Formation is Exothermic: When chemical bonds form, energy is released. This is because the atoms in the bonds are at a lower energy state than when they are separate.
* Bond Energy: The energy required to break a specific bond or the energy released when a bond is formed is called the bond energy.
Calculations
1. Identify the Bonds: Water (H₂O) has two O-H bonds.
2. Find the Bond Energy: The average bond energy for an O-H bond is approximately 463 kJ/mol.
3. Calculate for Two Moles:
* Energy per water molecule: 2 * 463 kJ/mol = 926 kJ/mol
* Energy for two moles: 926 kJ/mol * 2 mol = 1852 kJ
Therefore, approximately 1852 kJ of energy will be released when the bonds in two moles of water molecules are formed.
