Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 2.35 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.04 "C. Look up the freezing point and K, constant for cyclohexane in the Colligative Constants table. Calculate the molar mass of quinine. 313 molar mass: g/mol

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Solvent Formula
Kr value Normal freezing
(°C/m)
Kb value Normal boiling
(°C/m) point (°C)
point (°C)
water
H₂O
1.86
0.00
0.512
100.00
5.12
5.49
2.53
80.1
benzene C6H6
cyclohexane C6H12 20.8
6.59
2.92
80.7
ethanol C₂H60 1.99
-117.3:
1.22
78.4
carbon
CCI 4
29.8
-22.9
5.03
76,8
tetrachloride
camphor C10 H 16 0 37.8
176
"When using positive K, values, assume that AT, is the absolute value of the change in temperature. If you would prefer to define AT, as "final minus initial"
Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as
an antimalarial agent.
When 2.35 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.04 "C. Look up
the freezing point and K, constant for cyclohexane in the Colligative Constants table.
Calculate the molar mass of quinine.
313
g/mol
molar mass:
e
Incorrect
Transcribed Image Text:Solvent Formula Kr value Normal freezing (°C/m) Kb value Normal boiling (°C/m) point (°C) point (°C) water H₂O 1.86 0.00 0.512 100.00 5.12 5.49 2.53 80.1 benzene C6H6 cyclohexane C6H12 20.8 6.59 2.92 80.7 ethanol C₂H60 1.99 -117.3: 1.22 78.4 carbon CCI 4 29.8 -22.9 5.03 76,8 tetrachloride camphor C10 H 16 0 37.8 176 "When using positive K, values, assume that AT, is the absolute value of the change in temperature. If you would prefer to define AT, as "final minus initial" Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 2.35 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.04 "C. Look up the freezing point and K, constant for cyclohexane in the Colligative Constants table. Calculate the molar mass of quinine. 313 g/mol molar mass: e Incorrect
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