Ethanol, with AHvap = 40.5 kJ mol1, has a higher AHvapthan methanol, which is 35.2 kJ mol-1, due to its largersize and greater intermolecular forces. Because theAHvap for ethanol is larger, we would expect that forthe two liquids to reach the same vapor pressure, thetemperature for ethanol would haye to be higher. Ifthe vapor pressure is 0.0992 atm at 27.3 °C, whatwould the temperature be when the vapor pressureis 2.17 atm?The temperature will beiK.

Answered: Ethanol, with AHvan = 40.5 kJ mol1, has…

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter9: Liquids And Solids

Section: Chapter Questions

Problem 10RQ

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Ethanol, with AHvap = 40.5 kJ mol1, has a higher AHvap
than methanol, which is 35.2 kJ mol-1, due to its larger
size and greater intermolecular forces. Because the
AHvap for ethanol is larger, we would expect that for
the two liquids to reach the same vapor pressure, the
temperature for ethanol would haye to be higher. If
the vapor pressure is 0.0992 atm at 27.3 °C, what
would the temperature be when the vapor pressure
is 2.17 atm?
The temperature will be
i
K.

Expert Solution

Step 1

$\begin{array}{rcl} G i v e n d a t a, \\ ∆ H_{v a p} f o r e t h a n o l & = & 40.5 k J / m o l \\ I n i t i a l p r e s s u r e (P_{1}) & = & 0.0992 a t m \\ I n i t i a l t e m p e r a t u r e (T_{1}) & = & 27 . 3^{o} C \\ = & 27.3 + 273.15 = 300.45 K \\ F i n a l p r e s s u r e (P_{2}) & = & 2.17 a t m \\ F i n a l t e m p e r a t u r e (T_{2}) & = & ? \end{array}$

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