Caffeine (C8H10O2N4 • H2O) has an absorbance of 0.510 at 272 nm and 1 cm optical path in 1 mg / 100 mL concentration solutions. A 2.5 g sample of soluble coffee is diluted with water to 500 mL. Take 250 mL, add 25.0 mL of 0.1 N H2SO4 and dilute it to 500 mL. The absorbance at 272 nm resulting in 0.415. A) Calculate the grams of caffeine per kg of soluble coffee in the sample. The molar mass of caffeine is 212 g / mol.
Caffeine (C8H10O2N4 • H2O) has an absorbance of 0.510 at 272 nm and 1 cm optical path in 1 mg / 100 mL concentration solutions. A 2.5 g sample of soluble coffee is diluted with water to 500 mL. Take 250 mL, add 25.0 mL of 0.1 N H2SO4 and dilute it to 500 mL. The absorbance at 272 nm resulting in 0.415. A) Calculate the grams of caffeine per kg of soluble coffee in the sample. The molar mass of caffeine is 212 g / mol.
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Caffeine (C8H10O2N4 • H2O) has an absorbance of 0.510 at 272 nm and 1 cm optical path in
1 mg / 100 mL concentration solutions. A 2.5 g sample of soluble coffee is diluted with
water to 500 mL. Take 250 mL, add 25.0 mL of 0.1 N H2SO4 and dilute it to 500 mL. The
absorbance at 272 nm resulting in 0.415.
A) Calculate the grams of caffeine per kg of soluble coffee in the sample. The
molar mass of caffeine is 212 g / mol.
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