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Chap%201and2%20HW

# Chap%201and2%20HW - Problem 1-1 The Beer-Lambert Law...

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Problem 1-1 The Beer-Lambert Law describes the transmittance of light ( T ) as a function of extinction coefficient ( ε ), path length ( b ), and concentration of molecules ( c ). T = e bc The extinction coefficient is directly related to light absorbance ( A ) and is an intrinsic property of that compound. The Beer-Lambert Law may also be written as A = ε bc The table below give the extinction coefficients for ozone as a function of wavelength in the UV-B region of the spectrum. ε (cm - 1 ) λ (nm) 100 280 32 290 10 300 3 310 0.8 320 a. From the table, calculate the percent UV-B light transmitted to ground level as a function of wavelength. Note that T=1.0 is equivalent to 100% transmittance. [Hint: Assume bc = 0.35 cm the average thickness of pure ozone at ground level and equivalent to 350 DU overhead ozone.] b. If the concentration of ozone were decreased by 1%, how would transmittance of UV-B vary at each wavelength shown in the table? Problem 1-2 The average bond enthalpies of C-F and C-Cl are 484 and 338 kJ mol - 1 , respectively. a. Calculate the maximum wavelength of light required to break each of these bonds.

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