Photolysis of Water (Vacuum UV)

H2O → H· + OH·

Descripción general

Vacuum UV radiation (< 185 nm) directly dissociates water molecules into hydrogen and hydroxyl radicals. This reaction is significant in atmospheric chemistry on Mars and early Earth, where the photolysis of water vapor contributed to the loss of hydrogen to space and the oxidation of surface minerals.

Participantes

Rol Sustancia Coeficiente Estado
Reactivo Water H₂O 1 (g)

Ejemplo cotidiano

Mars lost most of its water over billions of years partly because UV photolysis split water vapor in the upper atmosphere.

Importancia industrial

Relevante en esterilización UV de agua y en la comprensión de la química de la alta atmósfera.

Propiedades

Tipo
Photochemical
Reversible
No
Energía
Endotérmico
ΔH
498,0 kJ/mol

Reacciones relacionadas

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Frequently Asked Questions

What is the equation for Photolysis of Water (Vacuum UV)?
The balanced equation is: H₂O → H· + OH·.
What type of reaction is Photolysis of Water (Vacuum UV)?
Photolysis of Water (Vacuum UV) is a photochemical reaction.
Is Photolysis of Water (Vacuum UV) exothermic or endothermic?
Photolysis of Water (Vacuum UV) is endothermic (absorbs energy). The enthalpy change (ΔH) is 498.0 kJ/mol.