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+clear;
+clc;
+// Example 11.2
+printf('Example 11.2\n\n');
+// Page no.315
+// Solution
+
+//Basis:1 hr
+G = 1400 ;//[kg]
+//Unit 1
+// Degree of freedom analysis 
+n_un = 16 ;// Number of unknowns in the given problem(excluding extent of reactions)
+n_ie  = 16 ;// Number of independent equations
+d_o_f =  n_un-n_ie ;// Number of degree of freedom
+printf('For unit 1 number of degree of freedom for the given system is  %i .\n',d_o_f);
+//Given
+o1_air = 0.995 ;// Mass fraction of air at out of unit 1 in A
+i1_air = 0.95 ;// Mass fraction air at in of unit 1 in G
+i1_wtr = 0.02;// Mass fraction water at in of unit 1 in G
+F1_wtr = 0.81 ;// Mass fraction of water at out of unit 1 in F
+o1_wtr = 0.005 ;// Mass fraction of water at out of unit 1 in A
+o2_wtr = 0.96 ;// Mass fraction of water at out of unit 2 in B
+o3_wtr = 0.01;// Mass fraction of water at out of unit 3 in D
+i1_act = 0.03 ;// Mass fraction of acetone at in of unit 1 in G
+F1_act = 0.19 ;//  Mass fraction of acetone at out of unit 1 in F
+o3_act = 0.99 ;//  Mass fraction of acetone at out of unit 3 in D
+o2_act  = 0.04 ;//  Mass fraction of acetone at out of unit 2 in B
+
+//Mass balance to get A ,W & F
+A = G*i1_air/o1_air ;//air-[kg]
+F = G*i1_act/F1_act ;//[kg]
+W = (F*F1_wtr+A*o1_wtr-G*i1_wtr)/1 ;//Pure water in -[kg]
+// unit 2 and 3
+// Degree of freedom analysis 
+n_un = 9 ;// Number of unknowns in the given problem(excluding extent of reactions)
+n_ie  = 9 ;// Number of independent equations
+d_o_f =  n_un-n_ie ;// Number of degree of freedom
+printf(' For unit 2 and 3 number of degree of freedom for the given system is  %i .\n',d_o_f);
+// Mass balance 
+// solving eqn (d)& (e) simultaneously for D and B
+a = [o3_act o2_act;o3_wtr o2_wtr];// Matrix formed by coefficients of unknown
+b = [F*F1_act;F*F1_wtr];// Matrix formed by constant
+x = a\b ;// Solution matrix-x(1) = D and x(2) = B
+printf('\n W-Pure water in to unit 1  -  %.2f kg/hr\n',W);
+printf(' A-Air out of unit 1        -  %.2f kg/hr\n',A);
+printf(' F-out of unit 1            -  %.2f kg/hr\n',F);
+printf(' B-out of unit 2            -  %.2f kg/hr\n',x(2));
+printf(' D-out of unit 3            -  %.2f kg/hr\n',x(1));
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