The vapor pressure of ethanol is 100 mmHg at 34.9°C. What is its vapor pressure at 63.5 °C? (AHvap for ethanol = 39.3 kJ/mol) P₁ AHvap (1 In P2 R T2 T₁ P₁ = 100 mm Hg/760 mm Hg atm-1 = 0.1316 atm T₁ = 34.9+273.15 = 308.1 K T₂ = 63.5+ 273.15 = 336.7 K = AH vap = 3.93 x 104 J/mol In P₁ = AH AHvap R 1 1 – 1 T₁₂ T 2 R 8.314 J/mol K P2 In = x => (0.3316-3831410873001)- P2 In (0.1316) - In(P2) = 4.727 x 103 (-2.75697 x 10-4) -In(P2) = 0.72477 => P2 = e-0.72477 => In(P2) = -0.72477 => P2 = 0.4844 atm = 368 mm Hg Search
The vapor pressure of ethanol is 100 mmHg at 34.9°C. What is its vapor pressure at 63.5 °C? (AHvap for ethanol = 39.3 kJ/mol) P₁ AHvap (1 In P2 R T2 T₁ P₁ = 100 mm Hg/760 mm Hg atm-1 = 0.1316 atm T₁ = 34.9+273.15 = 308.1 K T₂ = 63.5+ 273.15 = 336.7 K = AH vap = 3.93 x 104 J/mol In P₁ = AH AHvap R 1 1 – 1 T₁₂ T 2 R 8.314 J/mol K P2 In = x => (0.3316-3831410873001)- P2 In (0.1316) - In(P2) = 4.727 x 103 (-2.75697 x 10-4) -In(P2) = 0.72477 => P2 = e-0.72477 => In(P2) = -0.72477 => P2 = 0.4844 atm = 368 mm Hg Search
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter9: Liquids, Solids, And Materials
Section9.2: Vaporization And Condensation
Problem 9.2PSP: What mass (g) of ethanol, CH3CH2OH(), can be vaporized at its boiling point of 78.4 C by transfer of...
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Transcribed Image Text:The vapor pressure of ethanol is 100 mmHg at 34.9°C. What is its vapor
pressure at 63.5 °C? (AHvap for ethanol = 39.3 kJ/mol)
P₁ AHvap (1
In
P2
R T2 T₁
P₁ = 100 mm Hg/760 mm Hg atm-1 = 0.1316 atm
T₁ = 34.9+273.15 = 308.1 K
T₂ = 63.5+ 273.15 = 336.7 K
=
AH vap = 3.93 x 104 J/mol
In P₁ = AH
AHvap
R
1 1 – 1
T₁₂
T
2
R 8.314 J/mol K
P2
In
= x
=>
(0.3316-3831410873001)-
P2
In (0.1316) - In(P2) = 4.727 x 103 (-2.75697 x 10-4)
-In(P2) = 0.72477
=> P2 = e-0.72477
=> In(P2) = -0.72477
=> P2 = 0.4844 atm = 368 mm Hg
Search
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