When 1.54 of a certain molecular compound X are dissolved in 55. of g benzonitrile (c,H,CN), the freezing point of the solution is measured to be - 17.8 °C. Calculate the molar mass of x. If you need any additional information on benzonitrile, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits.

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section13.7: Colligative Properties Of Solutions
Problem 13.17CE
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When 1.54
of a certain molecular compound X are dissolved in 55. g of
benzonitrile (c,H,CN), the freezing point of the solution is measured to be
- 17.8 °C. Calculate the molar mass of x.
If you need any additional information on benzonitrile, use only what
you find in the ALEKS Data resource. Also, be sure your answer has a
unit symbol, and is rounded to the correct number of significant digits.
x10
Transcribed Image Text:When 1.54 of a certain molecular compound X are dissolved in 55. g of benzonitrile (c,H,CN), the freezing point of the solution is measured to be - 17.8 °C. Calculate the molar mass of x. If you need any additional information on benzonitrile, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits. x10
molal freezing point
depression constant
(Kf)
molal boiling point
elevation constant
(К»)
°C-kg-mol1
chemical
formula
melting
point (Tm)
boiling
point (Tp)
name
°C
°C
°C-kg-mol1
acetic acid
CH3CO2H
17.0
117.9
3.63
3.22
benzene
C6H6
5.538
80.08
5.07
2.64
benzonitrile
C6H5CN
-12.82
191
5.35
carbon
disulfide
CS2
-111.7
46.2
2.42
carbon
tetrachloride
CCI4
76.7
5.26
-22.8
cyclohexane
C6H12
6.7
80.7
20.8
2.92
dibenzyl ether
(CGH5CH2)20
1.8
298
6.17
2.2
diethyl ether
CH3CH20CH2CH3
-116.22
34.4
ethanol
CH3CH2OH
-114.14
78.24
1.23
ethylene
glycol
(CH2OH)2
-13.0
197.5
3.11
2.26
formamide
NH2COH
2.57
217
4.25
2.9
hexane
C6H14
-95.27
68.72
2.9
methanol
CH3OH
-97.5
64.5
80.22
218
7.45
naphthalene
C10H8
99.974
1.86
0.513
water
H20
Transcribed Image Text:molal freezing point depression constant (Kf) molal boiling point elevation constant (К») °C-kg-mol1 chemical formula melting point (Tm) boiling point (Tp) name °C °C °C-kg-mol1 acetic acid CH3CO2H 17.0 117.9 3.63 3.22 benzene C6H6 5.538 80.08 5.07 2.64 benzonitrile C6H5CN -12.82 191 5.35 carbon disulfide CS2 -111.7 46.2 2.42 carbon tetrachloride CCI4 76.7 5.26 -22.8 cyclohexane C6H12 6.7 80.7 20.8 2.92 dibenzyl ether (CGH5CH2)20 1.8 298 6.17 2.2 diethyl ether CH3CH20CH2CH3 -116.22 34.4 ethanol CH3CH2OH -114.14 78.24 1.23 ethylene glycol (CH2OH)2 -13.0 197.5 3.11 2.26 formamide NH2COH 2.57 217 4.25 2.9 hexane C6H14 -95.27 68.72 2.9 methanol CH3OH -97.5 64.5 80.22 218 7.45 naphthalene C10H8 99.974 1.86 0.513 water H20
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