Respuesta :
Diethyl ether has a H°vap of 29.1 kJ/mol and vapor pressure of 0.703 atm at 25.0°C. its vapor pressure at 90.0°C - 2.416 atm.
In such case to find vapor pressure at a specific temperature we use Clausius-Clapeyron equation
ln(P1/P2) =ΔHvap/R(1/T2−1/T1)
where.
Initial pressure P₁ = 0.703 atm,
Initial Temperature T₁ = 25+273 = 298K
Final temperature T₂ = 95+273 = 368K
Boff vaporization changes when H = 29.1 KJ/mol = 29100J/mol. 8.314 J/K.mol is the Boltzmann constant, or R.
ln(P1/P2)=ΔHvap/R(1/T2−1/T1)
ln(P1/P2)=29100/8.314(1/298 - 1/368)
ln(P1/P2)=1.234
P₂ = P₁ (3.43663) = (0.703 atm)(3.43663)
= 2.416 atm
Thus, vapor pressure at 60.0°C P₂ = 2.416 atm.
What is the temperature of a liquid at atmospheric pressure?
Temperature and Vapor or Saturation Pressure for some common Fluids. At atmospheric pressure saturation temperature of. water: 100 C (212 F) ethyl alcohol: 78.5 C (173 F)
What is the simple formula for vapor pressure?
Simple formula simple pressure = e^ (20.386 - (5132 / (temperature + 273)), where vapor pressure is expressed in mm Hg and temperature in kelvins.
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