molal freezing pointdepression constant(Kf)molal boiling pointelevation constant(К»)°C-kg-mol1chemicalformulameltingpoint (Tm)boilingpoint (Tp)name°C°C°C-kg-mol1acetic acidCH3CO2H17.0117.93.633.22benzeneC6H65.53880.085.072.64benzonitrileC6H5CN-12.821915.35carbondisulfideCS2-111.746.22.42carbontetrachlorideCCI476.75.26-22.8cyclohexaneC6H126.780.720.82.92dibenzyl ether(CGH5CH2)201.82986.172.2diethyl etherCH3CH20CH2CH3-116.2234.4ethanolCH3CH2OH-114.1478.241.23ethyleneglycol(CH2OH)2-13.0197.53.112.26formamideNH2COH2.572174.252.9hexaneC6H14-95.2768.722.9methanolCH3OH-97.564.580.222187.45naphthaleneC10H899.9741.860.513waterH20 When 21.0 g Oof a certain molecular compound X are dissolved in 55.0 gformamide (NH,COH), the freezing point of the solution is measured to beof-1.4 °C. Calculate the molar mass of x.If you need any additional information on formamide, use only what youfind in the ALEKS Data resource. Also, be sure your answer has a unitsymbol, and is rounded to the correct number of significant digits.

Given: Freezing point of NH2COH solution = -1.4 oC Mass of compound X dissolved = 21.0 g. Mass of…

Answered: When 21.0 of a certain molecular…

When 21.0 of a certain molecular compound X are dissolved in 55.0 g Of formamide (NH,COH), the freezing point of the solution is measured to be - 1.4 °C. Calculate the molar mass of x.

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 12.82QE: The freezing point of a 0.031-m solution of copper(II) sulfate in water is 0.075 C. (a) Calculate...

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Concept explainers

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

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

When 21.0 g Oof a certain molecular compound X are dissolved in 55.0 g
formamide (NH,COH), the freezing point of the solution is measured to be
of
-1.4 °C. Calculate the molar mass of x.
If you need any additional information on formamide, 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.

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