24-13. What are the units for absorptivity when the path length is given in centimeters centration is expressed in (a)parts per million? (b) micrograms per liter? (c)mass-volume percent? (d) grams per liter? 4-14. Express the following absorbances in terms of percen transmittance (a)0.0356 (b) 0.895 *(c) 0.379 (d)0.167 (e)0.485 (f)0.753 index or 1.)).

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24-13. What are the units for absorptivity when the path length is given in centimeters centration is expressed in (a)parts per million? (b) micrograms per liter? (c)mass-volume percent? (d) grams per liter? 4-14. Express the following absorbances in terms of percen transmittance (a)0.0356 (b) 0.895 *(c) 0.379 (d)0.167 (e)0.485 (f)0.753 index or 1.)).

Answer 1

24-13. The units for absorptivity depend on the units used for concentration and path length. When the path length is given in centimeters, the units for absorptivity are as follows:(a) parts per million (ppm): cm^-1(b) micrograms per liter (µg/L): cm^-1(c) mass-volume percent (% w/v): cm^-1(d) grams per liter (g/L): cm^-14-14. Absorbance (A) is related to percent transmittance (%T) using the following equation:A = -log(%T/100)Using this equation, we can express the given absorbances in terms of percent transmittance:(a) 0.0356: %T = 10^(-0.0356) * 100 = 2.66(b) 0.895: %T = 10^(-0.895) * 100 = 12.42(c) 0.379: %T = 10^(-0.379) * 100 = 29.92(d) 0.167: %T = 10^(-0.167) * 100 = 56.91(e) 0.485: %T = 10^(-0.485) * 100 = 39.81(f) 0.753: %T = 10^(-0.753) * 100 = 14.42

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