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+//Example 3.13
+clear;
+clc;
+
+//Given
+delHfNaOH = -470.7;//heat of formation in kJ of NaOH
+delHfOH = -228.8;//heat of formation of OH- ions in kJ
+
+//To determine the heat of formation of sodium ions
+delHNa = delHfNaOH-delHfOH;//heat of formation of sodium ions in kJ
+mprintf('heat of formation of sodium ions = %f kJ',delHNa);
+//end \ No newline at end of file