the volume of unknown sample used: 2.0ml The absorbance of the unknown: 0.287 least-squares equation: y= 0.266x -0.0049 the concentration of caffeine from the equation: 10.97 mg/mL the volume of extracted caffeine solution:??? the total mass of caffeine by spectroscopy: 54.85 mg caffeine % by spectroscopy: 1.11 %
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