The experimentally determined bond dissociation energy of a hydrogen molecule is__________?
Show answer Hide answer
Answer: C. 104Kcal/mol
Explanation
The experimentally determined bond dissociation energy of a hydrogen molecule is approximately 104 kcal/mol. Spectroscopic measurements confirm the robust covalent bond strength holding the diatomic hydrogen atoms together. This high energy requirement reflects the stable electron sharing within the simple diatomic molecular orbital. Bond dissociation energy is the standard enthalpy change required to break a specific covalent chemical bond homolytically. Diatomic hydrogen represents the simplest neutral molecule studied extensively in theoretical quantum chemistry. Thermochemical data tables rely on accurate experimental determinations of fundamental molecular bond strengths.
Energy calculations in combustion chemistry and rocket propulsion require precise values for molecular bond strengths. Understanding hydrogen bonding energetics helps researchers develop advanced clean energy storage technologies. Theoretical chemists use diatomic hydrogen as a benchmark system to test advanced molecular orbital calculations. One hundred ten kilocalories per mole overestimates the established experimental bond dissociation energy value. One hundred six kilocalories per mole differs from standard accepted thermochemical measurements for hydrogen. Numerical units must accurately reflect standard thermodynamic literature values for diatomic molecular bond breaking.
Related questions
Q1. The optimal synthetic pathway for preparing alkyl halides involves treating an alcohol with__________________?
Show answer Hide answer
Answer: B. SOCl2 / Pyridine
Treating an alcohol with thionyl chloride in the presence of pyridine is an optimal synthetic pathway. Gaseous byproducts like sulfur dioxide easily escape the reaction mixture and drive the substitution forward. Pyridin...
Q2. The chemical acid anhydride corresponding to HCIO4 is_________________?
Show answer Hide answer
Answer: D. Cl2O7
Dichlorine heptoxide is the chemical acid anhydride corresponding to perchloric acid. Reacting this chlorine oxide with water generates perchloric acid without changing oxidation states. It represents the highest oxide o...
Q3. Sodium fails to manifest a +2 oxidation state largely because of its__________________?
Show answer Hide answer
Answer: B. high second ioniation potential
Sodium does not exhibit a +2 oxidation state because removing a second electron requires enormous energy. The second electron must be stripped from a stable inner noble gas core electron configuration. This exceptionally...
Q4. The bond energy associated with the H-F linkage is________?
Show answer Hide answer
Answer: B. 562kJ/mol
The bond dissociation energy associated with the strong hydrogen-fluorine covalent linkage is approximately 562 kJ/mol. High electronegativity differences between hydrogen and fluorine create a remarkably strong polar co...
Q5. The primary chemical by-product generated during the saponification process is___________?
Show answer Hide answer
Answer: C. Glycerol
Glycerol is generated during the breakdown of fats in the alkaline saponification process. Triglyceride molecules react with sodium hydroxide to yield soap and a glycerol molecule. The chemical reaction splits the ester...
Q6. The fundamental magnitude of the charge carried by an electron was measured by ________ ?
Show answer Hide answer
Answer: D. Robert Millikan
The fundamental magnitude of the charge of an electron was precisely measured by Robert Millikan. His famous oil-drop experiment balanced gravitational forces against electric fields acting on charged droplets. This land...