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What would be the boiling point of methylene chloride at 670 mm Hg?

Question

What would be the boiling point of methylene chloride at 670 mm Hg?

 

check_circleAnswer
Step 1

Clausius-Clapeyron equation can be used to relate two points in the same equilibrium line. The equation is:

dHvap1
1
In
Т. т,
T.
P andP, vapor pressure at point land2
dH-Enthalpy of vaporizati on
R-8.314kJ/molK
T and T, Saturation temperature at pointland2
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dHvap1 1 In Т. т, T. P andP, vapor pressure at point land2 dH-Enthalpy of vaporizati on R-8.314kJ/molK T and T, Saturation temperature at pointland2

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Step 2

The known values of methylene ch...

T, 40.7 313.7K
P 760mm Hg
P, 670mmHg (given)
Hvap 28.6kJ/mol
Substitute all thevalues
dHvap1
1
n
P.
R
T T
670 mm Hg
In
29000 J/mol
1
1
760mm Hg
8.314 J/molK 313.7K T,
670mm Hg 8.314J/molK
n
1
28600J/mol 313.7K
TJ
760 mm Hg
-317.34K 44.34 °C
T2
help_outline

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T, 40.7 313.7K P 760mm Hg P, 670mmHg (given) Hvap 28.6kJ/mol Substitute all thevalues dHvap1 1 n P. R T T 670 mm Hg In 29000 J/mol 1 1 760mm Hg 8.314 J/molK 313.7K T, 670mm Hg 8.314J/molK n 1 28600J/mol 313.7K TJ 760 mm Hg -317.34K 44.34 °C T2

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