When 16.3 g of an organic compound known to be 57.15% C, 4.8% H, and 38.06% O by mass is dissolved in 700.7 g of water, the freezing point is −0.343⁢ ∘C. The normal freezing point of water is 0⁢ ∘C. What is the molecular formula for the organic compound? Assume that the organic compound is a molecular solid and does not ionize in water. ?f values for various solvents are given in the colligative constants table. Constants for freezing-point depression and boiling-point elevation calculations at 1 atm:Kf value* Normal freezing K value Normal boilingSolventFormula(°C/ m )point ( °C)(°C/ m)point ( °C)waterH201.860.000.512100.00C 6 H 6cyclohexane C 6 H 12C2 H 6 0benzene5.125.492.5380.120.86.592.9280.7ethanol1.99|-117.31.2278.4carbonСС 429.8-22.95.0376.8tetrachloridecamphorС 10 Н 16 0 37.8176

Given, the freezing point of pure solvent (water)(Tf0) = 00C The freezing point of solution (Tf) =…

Answered: When 16.3 g of an organic compound…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.87QE

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When 16.3 g of an organic compound known to be 57.15% C, 4.8% H, and 38.06% O by mass is dissolved in 700.7 g of water, the freezing point is −0.343⁢ ∘C. The normal freezing point of water is 0⁢ ∘C. What is the molecular formula for the organic compound? Assume that the organic compound is a molecular solid and does not ionize in water. ?f values for various solvents are given in the colligative constants table.

Constants for freezing-point depression and boiling-point elevation calculations at 1 atm:
K
f value* Normal freezing K value Normal boiling
Solvent
Formula
(°C/ m )
point ( °C)
(°C/ m)
point ( °C)
water
H20
1.86
0.00
0.512
100.00
C 6 H 6
cyclohexane C 6 H 12
C2 H 6 0
benzene
5.12
5.49
2.53
80.1
20.8
6.59
2.92
80.7
ethanol
1.99
|-117.3
1.22
78.4
carbon
СС 4
29.8
-22.9
5.03
76.8
tetrachloride
camphor
С 10 Н 16 0 37.8
176

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