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Answer in General Chemistry for Chanda #156014

Author:
March 17th, 2023

For a solution of acetophenone in hexane, the molar decadic absorptivity of the peak with λ max = 279 nm is 100 m2 mol-1

and I/I0 is 0.47. Calculate the concentration of acetophenone. Would you expect this concentration of acetophenone to change if the pathlength of light was altered from 1 cm to 3 cm, if so why

According to Beer-Lambert’s law;

“logdfrac{I_o}{I} =u03f5lc”

“log0.47 = 100 u00d7 1u00d7 10^{-2} u00d7 c”

“c u00d7 1 = log0.47”

c = 0.33 moldm-3

This concentration of acetophenone will change if the pathlength of light was altered from 1 cm to 3 cm, because the concentration is directly proportional to the width of the cuvette (path length of light).

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