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+//example 3.9
+
+clear;
+clc;
+
+disp("The standard heat of combustion of");
+disp("2C6H6(l)+ 15O2(g)-> 12 CO2(g)+ 6 H2O(l)");
+disp("H1(standard heat of combustion)=-6536 KJ/mol");
+//Given:
+H1=-6536;//standard heat of combustion [KJ/mol]
+
+//to find the standard heat of rxn for combustion of 1 mole of C6H6
+disp("C6H6(l)+ 7.5 O2(g)-> 6 CO2(g)+ 6 H2O(l)");
+H2=H1/2;//standard heat of combustion[KJ/mol]
+printf(" H2(standard heat of combustion for 1 mole of C6H6)= %f KJ/mol",H2);