Vapor at a pressure of 30.3 mbar from the solid compound pyrazine had a transmittance of 24.4%

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Vapor at a pressure of 30.3 mbar from the solid compound pyrazine had a transmittance of 24.4% at a wavelength of 266 nm in a 3.00-cm cell at 298 K.

(a) Convert transmittance to absorbance.
(b) Convert pressure to concentration (mol/L) with the ideal gas law.
(c) Find the molar absorptivity of gaseous pyrazine at 266 nm.

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