Introduction to Chemical Engineering Thermodynamics
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: McGraw-Hill Education
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Chapter 11, Problem 11.30P
Interpretation Introduction

(a)

Interpretation:

To find the heat liberated of isothermal mixing at 300 K

Concept Introduction:

We find the Excess enthalpy of H2SO4of pure and 25-wt-% from the H-x diagram of H2SO4

Then we find the enthalpy of Pure water.

The heat of mixing, Q is as given below,

  Q=x4H4x1H1x2H2x3H3

Where,

Mass of H2O= m1

Mass of H2SO4= m2 Mass of 25-wt-% H2SO4= m3 Total mass = m4

Enthalpy of Pure H2O = H1 Enthalpy of Pure H2SO4 (100-wt-%) = H2 Enthalpy of 25-wt-% H2SO4 = H3 Total enthalpy = H4

Mass fraction of H2O= x1

Mass fraction of H2SO4= x2 Mass fraction of 25-wt-% H2SO4= x3 Total mass fraction of H2SO4= x4

(b)

Interpretation Introduction

Interpretation:

To find the temperature of the intermediate solution formed

Concept Introduction:

We find the Excess enthalpy of H2SO4of pure and 25-wt-% from the H-x diagram of H2SO4

Then we find the enthalpy of Pure water.

The heat of mixing, Q is as given below,

  Q=x3H3x1H1x2H2

Where,

Mass of H2O= m1

Mass of H2SO4= m2 Total mass = m3

Enthalpy of Pure H2O = H1 Enthalpy of Pure H2SO4 (100-wt-%) = H2 Total enthalpy = H3

Mass fraction of H2O= x1

Mass fraction of H2SO4= x2 Total mass fraction of H2SO4= x3

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