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diff --git a/1427/CH16/EX16.21/16_21.sce b/1427/CH16/EX16.21/16_21.sce
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+//ques-16.21
+//Determining percent decomposition in a 30 percent solution
+clc
+Ea=70;//activation energy (in kJ/mol)
+a=100;//say
+x1=(25/100)*a;
+t=20;//time (in min)
+k1=(2.303/t)*log10(a/(a-x));//rate constant (in /min)
+T1=298; T2=313;//temperature (in K)
+//log10(k2/k1) = (Ea*(T2-T1))/(2.303*R*T1*T2)
+k2=5.554*10^-2;//rate constant (in /min)
+//k2 = (2.303/t)*log10(a/(a-x2))
+x2=66.97;
+printf("Percent decomposition required is %.2f.",x2);