Figure 3.3 (page 75):

Gibbs energy G versus reaction extent \varepsilon '.

Code for Figure 3.3

Text of the GNU GPL.

main.m

%% Copyright (C) 2001, James B. Rawlings and John G. Ekerdt
%%
%% This program is free software; you can redistribute it and/or
%% modify it under the terms of the GNU General Public License as
%% published by the Free Software Foundation; either version 2, or (at
%% your option) any later version.
%%
%% This program is distributed in the hope that it will be useful, but
%% WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
%% General Public License for more details.
%%
%% You should have received a copy of the GNU General Public License
%% along with this program; see the file COPYING.  If not, write to
%% the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
%% MA 02111-1307, USA.

K = 108;
P = 2.5;
npts = 100;
x = linspace(0,0.5,npts)';
G = -x*log(108) + (1-x)*log(2.5) + x.*log(x) +  ...
    2*(0.5-x).*log(0.5-x) - (1-x).*log(1-x);
G(1)    = log(2.5) + 2*0.5*log(0.5);
G(npts) = -0.5*log(108) + 0.5*log(2.5);
table = [x G];
plot (table(:,1), table(:,2));
title ('Figure 3.3')