The bond energy of Hydrogen molecule is__________?
Correct answer: C. 104Kcal/mol
- A. 110Kcal/mol
- B. 106Kcal/mol
- C. 104Kcal/mol
- D. 150KJcal/mol
Explanation
The H-H bond dissociation energy is about 436 kJ mol^-1, which is approximately 104 kcal mol^-1 because 1 kcal = 4.184 kJ and 436 kJ mol^-1 / 4.184 kJ kcal^-1 = 104.2 kcal mol^-1. Students may choose 110 kcal mol^-1 by using a rough estimate rather than the accepted value.
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About Bond Energy
Bond energy is the energy needed to break one mole of a particular covalent bond in gaseous molecules, while bond formation releases energy. Reaction enthalpy is estimated by subtracting the total energy of bonds formed from bonds broken, with attention to average bond energies and their limitations for specific molecules.
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