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+//ques-18.23
+//Calculating standard free energy change for the reaction
+clc
+//G = free energy (in kJ/mol)
+G1=-16.8;//ammonia
+G2=-86.7;//NO
+G3=-237.2;//water
+G=G2+G3*(1.5)-G1;//free energy change
+printf("The free energy change required is %.1f kJ/mol.",G);