Question
Asked Nov 21, 2019
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5. The boiling point of a NaCl solution is 101.04 °C.
a. What is the molality (m) of the solute particles in the NaCl solution?
b. What is the freezing point of the NaCl solution?
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5. The boiling point of a NaCl solution is 101.04 °C. a. What is the molality (m) of the solute particles in the NaCl solution? b. What is the freezing point of the NaCl solution?

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Expert Answer

Step 1

Given:

Boiling point of NaCl solution is 100 oC.

Boiling point of pure water is 101.04 oC.

 Van't Hoff factor, i will be equal to 2 because we get two moles of particles per mole of sodium chloride added to the solution

The ebullioscopic constant of water is equal to 0.512oC kg mol^−1.

Step 2

Elevation of boiling point is given by:

ДТь 3D іх Кь Х m
ΔΤ,
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ДТь 3D іх Кь Х m ΔΤ,

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Step 3

Calculation for molali...

ДТЬ — іх Кь xm
(101.04°C — 100°C) — 2 х 0.512°С Kg/mol x m
1.04°C 2 x 0.512 °C Kg/mol x m
1.024°C Kg/mol x m
1.04°C
1.04°C
1.024°C Kg/mol
1.02 mol/Kg
m =
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ДТЬ — іх Кь xm (101.04°C — 100°C) — 2 х 0.512°С Kg/mol x m 1.04°C 2 x 0.512 °C Kg/mol x m 1.024°C Kg/mol x m 1.04°C 1.04°C 1.024°C Kg/mol 1.02 mol/Kg m =

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