Dihydrogen appears composed of two hydrogen atoms linked by a covalent bond, formed by a covalent bond between two hydrogen atoms. It is the lightest known molecule with a molecular weight of about 2.016 u. Under ambient conditions it is a colorless, odorless, highly flammable gas. Nonpolarity limits its solubility in water. The H–H bond strength yields about 435 kJ/mol dissociation enthalpy, which governs its chemical reactivity and inertness under ambient conditions.
Dihydrogen is the homonuclear diatomic molecule formed from two hydrogen atoms. This molecule features a covalent bond between two hydrogen atoms, satisfying each of their required duet configurations. Since hydrogen is the lightest element on the modern periodic table, dihydrogen is the lightest known molecule. Since the standard atomic weight of the hydrogen atom is 1.008u, the molecular weight of the dihydrogen molecule is 2.016 atomic mass units.
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edurev.inDihydrogen - Introduction A hydrogen atom weighs the least. Hydrogen is a gas with the formula 𝐻2 that exists normally. It is made up of diatomic molecules. In addition to being very combustible, it has no colour or smell. With approximately 75% of all normal matter made up of hydrogen, it is the most prevale
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