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What are the boiling point and freezing point of a 3.47 m solution of naphthalene in benzene? (the boiling point and freezing point of benzene are 80.1°c and 5.5°c respectively. the boiling point elevation constant for benzene is 2.53°c/m, and the freezing point depression constant for benzene is 5.12°c/m.)?

Respuesta :

PBCHEM
Elevation in boiling point is mathematically expressed as
ΔTb = Kb X m

where Kb =  boiling point elevation constant =  2.53°c/m (for benzene)
m = molality of solution = 3.47 m (given)

∴ ΔTb = 2.53 X 3.47
           = 8.779 oC

But, boiling point of benzene = 80.1 oC
∴ Boiling point of solution = 88.879 oC

Now, Depression in freezing point = ΔTf = Kf X m
where, Kf = freezing point depression constant = 5.12°c/m (for benzene)

∴ ΔTf = 5.12 X 3.47
         = 17.766 oC

But freezing point of benzene = 5.5 oC
∴ Freezing point of solution = -12.266 oC

The study of chemicals and bonds is called chemistry. There are two types of elements and these are metals and nonmetals.

The correct answer is -12.266.

What is the boiling point?

  • The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapor pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury).
  • At sea level, water boils at 100° C.

Elevation in boiling point is mathematically expressed as

[tex]Tb = Kb * m[/tex]

Where

  • Kb =  boiling point elevation constant =  2.53°c/m (for benzene)
  • m = molality of solution = 3.47 m (given)

ΔTb[tex]= 2.53 * 3.47 = 8.779 oC[/tex]

But, the boiling point of benzene = 80.1 oC

Boiling point of solution = 88.879 oC

Now, Depression in freezing point = ΔTf[tex]= Kf * m[/tex]

where,

  • Kf = freezing point depression constant = 5.12°c/m (for benzene)

ΔTf =[tex]5.12 X*3.47 = 17.766 oC[/tex]

But the freezing point of benzene = 5.5 oC.

Freezing point of solution = -12.266 oC.

For more information about the boiling point, refer to the link:-

https://brainly.com/question/9864045

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