Answered: Antoine’s equation: log10 P* = A – B…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

Vapor pressure for n-hexane (C6 H14) and n-pentane (C7 H16) may be calculated from the Antoine’s equation:

log₁₀ P* = A – B / (T+ ^oC)
Where A, B, C are the constants as follows:
For n-hexane: A = 7.0151, B = 1246.33, C = 232.988
For n-heptane: A = 6.90253, B = 1267.818, C = 216. 823
P* = vapor pressure in mm Hg
T = temperature in °C

1- Find the normal boiling point temperature, Tb, of n-hexane in °C
a) From standard data.
b) From Antoine’s equation above

2- How many moles of n-heptane should be added to 1 mole of n-hexane to increase the normal boiling point (also called bubble point) of the solution to 80 °C. Assume Raoult’s law is applicable.

3- In question 2, find composition of the bubble in mole fractions.

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