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Principles Of Pharmacology Med Assist

Principles Of Pharmacology Med Assist

6th Edition

ISBN:9781337512442

Author:RICE

Publisher:RICE

Chapter1: Numerals And Fractions

Section: Chapter Questions

Problem 5RP

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Question

The following data was collected for n-pentane and isopentane:
Compound
P, (kPa)
n-pentane
282.9 at 70°C
895.5 at 120°C
Isopentane
955.9 at 115°C
1152.4 at 125°C
а)
Develop a correlation for the vapor pressure of Isopentane as a function of temperature. Clearly state the
units.
b)
Calculate the vapor pressure of Isopentane at 120°C.
c)
Estimate the heat of vaporization of Isopentane by using the data in the table.
A closed container contains a mixture of 65.0 mol% n-pentane and 35.0 mol% isopentane. The system is
initially all liquid at 120.0°C and high pressure and the pressure is gradually reduced at a constant
temperature.
d)
i.
Calculate the pressure (in kPa) at which the first bubble of vapor forms.
ii.
What is the composition (in mole fractions) of the first bubble of vapor at the conditions found in part
(i)?
A new mixture contains cyclohexane (Pv=288.3kPa at 120°C), n-pentane and isopentane at 120°C and high
pressure. The pressure is reduced at constant temperature to a point at which the liquid phase contains 37.5
mol% n-pentane and the vapor phase contains 15.2 mol% cyclohexane. What is the pressure at which this
vapor-liquid equilibrium is reached?
e)

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