Question
Asked Feb 23, 2020
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Using the vapor-pressure curves in Figure 11.25, (a) estimate
the boiling point of ethanol at an external pressure of 200
torr, (b) estimate the external pressure at which ethanol
will boil at 60 °C, (c) estimate the boiling point of diethyl
ether at 400 torr, (d) estimate the external pressure at which
diethyl ether will boil at 40 °C.

34.6 °C
78.3 °C 100 °C
800
760
Normal boiling
point
Diethyl
ether
600
Ethyl alcohol
(ethanol)
Water
400
200
Ethylene
glycol
20
40
80
100
Temperature (°C)
A Figure 11.25 Vapor pressure for four liquids as a function of
temperature.
Vapor pressure (torr)
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34.6 °C 78.3 °C 100 °C 800 760 Normal boiling point Diethyl ether 600 Ethyl alcohol (ethanol) Water 400 200 Ethylene glycol 20 40 80 100 Temperature (°C) A Figure 11.25 Vapor pressure for four liquids as a function of temperature. Vapor pressure (torr)

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