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diff --git a/1427/CH18/EX18.21/18_21.sce b/1427/CH18/EX18.21/18_21.sce
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+//ques-18.21
+//Determining heat of formation at constant volume
+clc
+H=-74.85;//heat of formation of methane at constant pressure (in kJ/mol)
+n=1-2;//change in gaseous moles
+T=273+25;//temperature (in K)
+U=H*1000-n*8.314*T;//heat of formation at constant volume
+printf("Heat of formation at constant volume is %.2f kJ/mol.",U/1000);