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Stratospheric ozone filters UV light in the atmosphere to protect us from its harmful effects. the absorbtion coefficient of O_3 at
(lambda= 300nm)
is
(epsilon_{O3}=211.4 cm^{-1} M^{-1})
A balloon equipped with a UV spectrometer was flown in the stratosphere to measure the [O_3] at an altitude of 25 km. The spectrometer had an absorbtion path length of b= 1000.0 m and measured a transmittance of T = 0.6952. Determine the concentration of O_3 at this altitude.

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