Asked by sstt
The energy required to break one mole of bonds of particular type between atoms is called bond energy. Consider the reaction:
H2 (g) + O2 (g) H2O (l)
The bond energy of an O–H bond is 449.08 kJ/mol, when one mole of water is formed.
What is the amount of energy required to be absorbed/released in the dissociation of 1 mole of water?
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Each H2O has two O–H bonds, so breaking one mole of H2O requires breaking 2 moles of O–H bonds:
Energy = 2 × 449.08 kJ/mol = 898.16 kJ/mol.
Thus about 898.16 kJ must be absorbed to dissociate one mole of H2O (i.e., +898.16 kJ·mol⁻¹).
Energy = 2 × 449.08 kJ/mol = 898.16 kJ/mol.
Thus about 898.16 kJ must be absorbed to dissociate one mole of H2O (i.e., +898.16 kJ·mol⁻¹).
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