Question 13.54 states: Caffeine(C 8 H 10 N 4 O 2 ) is astimulant found in coffee

Question

Question 13.54 states: Caffeine(C8H10N4O2) is astimulant found in coffee and tea. If a solution of a caffeine inchloroform (CHCl3) as a solvent has a concentration of0.0750 m, calculate (a) the percent caffeine by mass, (b)the mole fraction of caffeine. I am not sure how to even start this problem let alone findthe answer, please help! Question 13.54 states: Caffeine(C8H10N4O2) is astimulant found in coffee and tea. If a solution of a caffeine inchloroform (CHCl3) as a solvent has a concentration of0.0750 m, calculate (a) the percent caffeine by mass, (b)the mole fraction of caffeine. I am not sure how to even start this problem let alone findthe answer, please help!

Explanation / Answer

C8H10N4O2=194 amu CHCl3=119.4 amu Part a. Assume 1 kg = 1000 g .0750 mol C8H10N4O2 x 194 g/mol = 14.55 g C8H10N4O2 1000 g - 14.55 = 985.45 g Mass percent of caffeine : 14.55 / 985.45 x 100 =1.48 % Part b Mole of caffeine: .0750 Mole of CHCl3 = 985.45/119.4 g/mol = 8.25 mol Mole fraction of caffeine: .0750 / (.0750 + 8.25) = .009

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