Ozone Decomposition by UV

2O3 → 3O2

Tổng quan

UV-C radiation (< 240 nm) and UV-B (240–320 nm) break ozone back into molecular oxygen and atomic oxygen. This absorption of UV is precisely what protects life on Earth. The steady-state balance between ozone formation and decomposition maintains the ozone layer thickness.

Người tham gia

Vai trò Chất Hệ số Trạng thái
Chất phản ứng Ozone O₃ 2 (g)

Ví dụ thực tế

Sunscreen with high SPF is needed because not all UV is filtered by ozone — the remaining UV-A and some UV-B still reach the surface.

Tầm quan trọng công nghiệp

Understanding ozone photochemistry is critical for monitoring the ozone hole and predicting UV exposure levels worldwide.

Tính chất

Loại
Photochemical
Thuận nghịch
Không
Năng lượng
Tỏa nhiệt
ΔH
-285,4 kJ/mol

Phản ứng liên quan

Photochemical Smog Formation (NO₂ Photolysis) Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Dye-Sensitized Solar Cell (Grätzel Cell)

Frequently Asked Questions

What is the equation for Ozone Decomposition by UV?
The balanced equation is: 2O₃ → 3O₂.
What type of reaction is Ozone Decomposition by UV?
Ozone Decomposition by UV is a photochemical reaction.
Is Ozone Decomposition by UV exothermic or endothermic?
Ozone Decomposition by UV is exothermic (releases energy). The enthalpy change (ΔH) is -285.4 kJ/mol.